CN218633892U - Silicon controlled rectifier circuit and electronic equipment - Google Patents
Silicon controlled rectifier circuit and electronic equipment Download PDFInfo
- Publication number
- CN218633892U CN218633892U CN202222392498.3U CN202222392498U CN218633892U CN 218633892 U CN218633892 U CN 218633892U CN 202222392498 U CN202222392498 U CN 202222392498U CN 218633892 U CN218633892 U CN 218633892U
- Authority
- CN
- China
- Prior art keywords
- module
- resistor
- zero
- control
- diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Power Conversion In General (AREA)
Abstract
The embodiment of the application discloses a silicon controlled rectifier circuit and electronic equipment. The silicon controlled rectifier circuit comprises a live wire terminal, a zero line terminal, a first control module and a silicon controlled rectifier module; the live wire terminal and the zero line terminal are connected with the input end of the first control module and the zero-crossing detection end, and the zero-crossing detection end is used for detecting a zero-crossing signal of alternating current; the output end of the first control module is connected with the control end of the silicon controlled module, and the first control module is used for transmitting a level signal to the control end of the silicon controlled module through the output end after detecting a zero-crossing signal; the first end and the zero line terminal of silicon controlled rectifier module are connected, and the second end is used for being connected with load module, and the silicon controlled rectifier module is used for making first end and second end switch on according to the level signal that the control end received, can solve the low problem of silicon controlled rectifier circuit security, promote silicon controlled rectifier circuit's security and interference killing feature.
Description
Technical Field
The embodiment of the application relates to the technical field of electric energy control, in particular to a silicon controlled rectifier circuit and electronic equipment.
Background
In an ac circuit, the direction of the alternating current is changed alternately at the frequency of the alternating current, and the current flows from the first pole to the second pole in the first half cycle, and the direction of the current flows in the second half cycle in the opposite direction, and flows from the second pole to the first pole. The thyristor is a commonly used semiconductor device capable of conducting in two directions in an alternating current circuit, and can be used for functions of controllable rectification, contactless switches and the like. The conduction of the bidirectional thyristor can be controlled as long as the driving signal is applied to the control electrode (G electrode).
When the bidirectional triode thyristor works, as the current flowing between the first main electrode and the second main electrode of the bidirectional triode thyristor is bidirectional flowing alternating current, when the alternating current is in a wave crest or a wave trough, the conduction or the cut-off of a triode thyristor loop can cause great impact current and impact voltage, easily damages devices and causes harmonic interference.
In an alternating current circuit of the related art, a bidirectional thyristor is directly switched on according to the switching-on of a driving signal, a thyristor loop may be switched on or switched off when alternating current is in a wave crest or a wave trough, devices are easily damaged, harmonic interference is caused, and the thyristor circuit is low in safety and weak in interference resistance.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a silicon controlled rectifier circuit and electronic equipment, which can solve the problem of low safety of the silicon controlled rectifier circuit and improve the safety and the anti-interference capability of the silicon controlled rectifier circuit.
An embodiment of the present application provides a thyristor circuit, configured to supply power to a load module, including: the fire wire terminal, the zero line terminal, the first control module and the silicon controlled module;
the live wire terminal and the zero line terminal are both connected with the input end of the first control module and a zero-crossing detection end, and the zero-crossing detection end is used for detecting a zero-crossing signal of alternating current;
the output end of the first control module is connected with the control end of the silicon controlled module, and the first control module is used for transmitting a level signal to the control end of the silicon controlled module through the output end after detecting a zero-crossing signal;
the first end of the silicon controlled module is connected with the zero line terminal, the second end of the silicon controlled module is connected with the load module, and the silicon controlled module is used for enabling the first end and the second end to be conducted according to the level signal received by the control end.
The embodiment of the application also provides electronic equipment which comprises the silicon controlled rectifier circuit.
Through the control end that first control module transmitted level signal for the silicon controlled rectifier module through the output after detecting zero cross signal to make silicon controlled rectifier module first end and second end switch on, thereby supply power for load module, avoided appearing switching on or cutting off the condition in silicon controlled rectifier return circuit when the alternating current is in crest or trough, promote silicon controlled rectifier circuit's security and interference killing feature.
Drawings
FIG. 1 is a schematic diagram of the operation of a thyristor module to supply power to a load;
fig. 2 is a first circuit schematic diagram of a thyristor circuit provided in an embodiment of the present application;
FIG. 3 is a schematic diagram of zero-crossing switching provided by an embodiment of the present application;
FIG. 4 is a schematic circuit diagram of a first control module provided in an embodiment of the present application;
fig. 5 is a schematic circuit diagram of a driving module according to an embodiment of the present application;
FIG. 6 is a circuit schematic diagram of a zero-crossing detection module provided by an embodiment of the present application;
FIG. 7 is a schematic diagram of a second control module detection waveform provided by an embodiment of the present application;
fig. 8 is a schematic circuit diagram of a thyristor module according to an embodiment of the present application;
FIG. 9 is a schematic view of the operating quadrant of the thyristor module;
fig. 10 is a second circuit schematic diagram of a thyristor circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
The silicon controlled module is a power device commonly used in an alternating current circuit and can be used for functions of controllable rectification, contactless switching and the like. In the alternating current circuit, the current direction of alternating current is changed alternately according to the alternating current frequency, the current flows from one pole to the other pole in the first half cycle, and the current flow direction is opposite in the second half cycle, so that a semiconductor device capable of conducting in two directions is needed, the bidirectional thyristor module is a semiconductor device with bidirectional conduction, and the bidirectional thyristor can be controlled to conduct as long as a driving signal is applied to a control pole (control end) of the thyristor module.
Fig. 1 is a schematic diagram of an operating principle of a triac module for supplying power to a load, and as shown in fig. 1, since a current flowing between a first main electrode T1 terminal and a second main electrode T2 terminal of a triac is a bidirectional alternating current, when the alternating current is at a peak or a valley, a large impact current and an impact voltage are caused by switching on a triac loop or switching off the triac loop, which easily damages a device and causes harmonic interference. Therefore, in order to avoid damaging the device, the thyristor loop needs to be switched on or switched off when the alternating current crosses zero, so that the surge voltage and the surge current can be reduced to the minimum, thereby protecting the device and reducing harmonic interference. Therefore, a thyristor circuit is provided to realize a zero-crossing conduction thyristor loop.
Fig. 2 shows a first circuit diagram of a thyristor circuit provided in the embodiment of the present application, which is used to supply power to a load 50, where the load 50 is a load used by an actual product in operation, and includes a resistive load, an inductive load, or a capacitive load. As shown in fig. 2, the thyristor circuit includes a live terminal 10, a neutral terminal 20, a first control module 30, and a thyristor module 40. The live wire terminal 10 is used for accessing a live wire of alternating current, and the zero wire terminal 20 is used for accessing a zero wire of alternating current. The first control module 30 includes four ports, which are two input terminals, an output terminal drive, and a Zero-crossing detection terminal Zero. The input terminal is used for receiving ac power to supply power to the first control module 30, so as to realize normal operation of the first control module 30. The live wire terminal 10 and the neutral wire terminal 20 are both connected to an input end of the first control module 30 and a Zero-cross detection end Zero, and the Zero-cross detection end Zero is used for detecting a Zero-cross signal of the alternating current. The output drive of the first control module 30 is connected with the control end G1 of the thyristor module 40, and the first control module 30 is configured to transmit a level signal to the control end G1 of the thyristor module 40 through the output drive after detecting a zero-crossing signal. The thyristor module 40 has a first end connected to the neutral terminal 20, a second end connected to the load 50 module, and the thyristor module 40 is configured to conduct the first end and the second end according to a level signal received by the control end G1 to supply power to the load 50 module. The silicon controlled module 40 is switched on by outputting the level signal after the Zero-crossing detection end Zero detects the Zero-crossing of the alternating current, so that the situation that the device is easily damaged and harmonic interference is caused by switching on the silicon controlled loop or cutting off the silicon controlled loop when the alternating current is at the wave crest or the wave trough to cause large impact current and impact voltage is avoided, and the safety and the anti-interference capability of the silicon controlled circuit are improved.
Fig. 3 is a schematic diagram of Zero-crossing turn-on provided in an embodiment of the present application, when the thyristor circuit supplies power to the load 50, as shown in fig. 3, when the Zero-crossing detection end Zero of the first control module 30 detects that the voltage of the alternating current is after the Zero-crossing point, the output end drive of the first control module 30 outputs a level signal to the control end G1 of the thyristor module 40, the control end G1 of the thyristor module 40 receives the driving signal PWM to enable the corresponding first end and second end to be connected, and the second end is connected to the load 50, so as to supply power to the load 50. After the zero crossing point, the voltage and the current of the alternating current near the zero point are very small, so that the voltage and the current cannot be greatly impacted, and the purposes of protecting devices and reducing harmonic waves are achieved.
Fig. 4 is a schematic circuit diagram of the first control module 30 according to an embodiment of the present disclosure, and as shown in fig. 4, the first control module 30 includes a driving module 301, a second control module 302, and a zero-crossing detection module 303. The driving module 301 is configured to receive a driving signal PWM, and transmit power input through the live terminal 10 and the neutral terminal 20 to the second control module 302 according to the driving signal PWM. The live wire terminal 10 and the neutral wire terminal 20 are respectively connected with a first power end and a second power end of the driving module 301 to realize the input of alternating current. A first output terminal of the driving module 301 is connected to an input terminal VCC of the second control module 302, and when receiving the driving signal PWM, the driving module transmits the working current to the second control module 302 corresponding to the control of the driving signal PWM. A second output terminal of the driving module 301 is connected to a ground terminal GND of the second control module 302, and a fifth terminal of the driving module 301 is grounded. The Zero-cross detection end Zero of the second control module 302 is connected with the first end of the Zero-cross detection module 303, the second end of the Zero-cross detection module 303 is connected with the live wire terminal 10, the third end of the Zero-cross detection module 303 is connected with the Zero line terminal 20, the fourth end of the Zero-cross detection module 303 is grounded, the Zero-cross detection module 303 can transmit current and voltage signals of the live wire terminal 10 and the Zero line terminal 20 to the Zero-cross detection end Zero of the second control module, and therefore the second control module 302 can obtain the instantaneous voltage state of an alternating current power supply in a corresponding silicon controlled circuit through the Zero-cross detection end Zero. The output drive of the second control module 302 is connected with the control end G1 of the thyristor module 40, the first end of the thyristor module 40 is connected with the zero line terminal 20, and the second end is connected with the load 50 module. The load 50 module has a first end connected to the second end of the thyristor module 40 and a second end connected to the hot terminal 10. Referring to fig. 3, based on the instantaneous voltage state of the ac power supply, whenever the ac power is near the zero crossing point, the output drive of the second control module 302 outputs a level signal to the control terminal G1 of the thyristor module 40, and the thyristor module 40 controls the conduction state of the first terminal and the second terminal based on the level signal received by the control terminal G1, so that the thyristor loop is turned on or turned off when the ac power crosses the zero crossing point, and the impact can be minimized, thereby protecting the device and reducing the harmonic interference, and realizing the safe power supply to the load 50 module. The silicon controlled module 40 is switched on by outputting the level signal after the Zero-crossing detection end Zero detects the Zero crossing of the alternating current, so that the situation that the device is easily damaged and harmonic interference is caused due to the fact that the silicon controlled loop is switched on or switched off when the alternating current is in a wave crest or a wave trough to cause large impact current and impact voltage is avoided, and the safety and the anti-interference capability of the silicon controlled circuit are improved.
It should be noted that the second control module 302 is a single chip or a control chip.
Fig. 5 is a schematic circuit diagram of a driving module 301 according to an embodiment of the present disclosure, and as shown in fig. 5, the driving module 301 includes a rectifier bridge BD1, a first control switch Q1, a transformer TF1, and a first diode D1, where the rectifier bridge BD1 is used to convert ac power into dc power, and the transformer TF1 is used to transfer energy and voltage transformation ratio. A pin 2 of an alternating current input end of a rectifier bridge BD1 is connected with a zero line terminal 20, a pin 3 of another alternating current input end is connected with a live wire terminal 10, a pin 1 of a positive output end of the rectifier bridge BD1 is connected with a first pin of a primary side of a transformer TF1, a pin 4 of a negative output end of the rectifier bridge BD1 is connected with a first end of a first control switch Q1 and grounded, a second end of the first control switch Q1 is used for receiving a driving signal PWM, a third end of the first control switch Q1 is connected with a second pin of the primary side of the transformer TF1, and the first control switch Q1 is used for realizing conduction of the first end and the third end according to the driving signal PWM, so that currents flowing out from the pin 1 of the positive output end and the pin 4 of the negative output end of the rectifier bridge BD1 are transmitted to the first pin and the second pin of the primary side of the transformer TF 1. The on or off time of the first control switch Q1 is controlled based on the driving signal PWM, so that the secondary side of the transformer TF1 obtains a stable output voltage Vout. A third pin of the secondary side of the transformer TF1 is connected to an anode of the first diode D1, a cathode of the first diode D1 is connected to the zero line terminal 20 and the input terminal VCC of the second control module 302, and a fourth pin of the secondary side of the transformer TF1 is connected to the ground terminal GND of the second control module 302. The output voltage Vout on the secondary side of the transformer TF1 is normally established and then flows into the input terminal VCC of the second control module 302 through the first diode D1, so as to supply power to the second control module 302. The first diode D1 is a rectifying diode, and functions to prevent a reverse flow of voltage.
The first control switch Q1 comprises a field effect transistor, a source electrode of the field effect transistor is connected with a pin 4 of a negative electrode output end of the rectifier bridge BD1, a grid electrode of the field effect transistor is used for receiving a driving signal PWM, a drain electrode of the field effect transistor is connected with a second pin of a primary side of the transformer TF1, and the field effect transistor is used for enabling the source electrode and the drain electrode to be conducted according to the driving signal PWM received by the grid electrode. The conduction of the primary side of the transformer TF1 can be controlled through the driving signal PWM, and the voltage value of the primary side of the transformer TF1 can be controlled, so that the output voltage value of the secondary side of the transformer TF1 can be controlled.
Note that, the pin of the negative output terminal 4 of the rectifier bridge BD1 is grounded to PGND.
It should be noted that the first control switch Q1 may be other switching tubes besides a field effect transistor (MOS tube), such as a controllable device like an IGBT.
The driving module 301 further includes an electrolytic capacitor E1 and a first capacitor C1. The positive pole of electrolytic capacitor E1 is connected with 1 pin of the positive pole output terminal of rectifier bridge BD1, and the negative pole is connected with 4 pins of the negative pole output terminal of rectifier bridge BD 1. The electrolytic capacitor E1 is used to stabilize the voltage of the dc current converted by the rectifier bridge BD1, and the capacitance value is generally large. A first end of the first capacitor C1 is connected to the cathode of the first diode D1, and a second end is connected to the ground GND of the second control module 302. The first capacitor C1 is used for stabilizing the Vout voltage.
After the alternating current is converted into the direct current through the rectifier bridge BD1, the conduction control of the direct current input to the second control module 302 is realized through the driving module 301, and the functions of driving input and driving a switch are realized, so that the conduction current is input to the second control module 302 after the driving signal PWM is received, the power supply of the second control module 302 is realized, the operation of the second control module 302 is ensured, and the basic current is provided for the driving signal PWM of the control end G1 of the subsequent thyristor module 40.
Fig. 6 is a circuit schematic diagram of the zero-crossing detection module 303 according to an embodiment of the present disclosure, and as shown in fig. 6, the zero-crossing detection module 303 includes a resistor module 3031, a first resistor R1, a second resistor R2, a second diode D2, and a third diode D3. The resistor module 3031 has a first terminal connected to the hot terminal 10 and a second terminal connected to the anode of the second diode D2 and to a first terminal of the first resistor R1. The resistor module 3031 plays a role in current limiting to protect circuit devices. The cathode of the second diode D2 is connected to the neutral terminal 20 and the first end of the second resistor R2. The second terminal of the first resistor R1 is connected to the anode of the third diode D3, the second terminal of the second resistor R2, and the Zero-crossing detection terminal Zero of the second control module 302, and is grounded. The cathode of the third diode D3 is connected to the first end of the first resistor R1 and the Zero-crossing detection terminal Zero of the second control module 302. Second diode D2 and third diode D3 provide a path between hot terminal 10 and neutral terminal 20.
When the alternating current is in a positive half cycle, namely the current of the live wire terminal 10 is positive, the current of the zero line terminal 20 is negative, and the voltage at the zero line terminal 20 is Vout, the detection loop is the live wire terminal 10-the resistance module 3031-the second diode D2-the zero line terminal 20. When the second diode D2 is turned on, if the cathode of the third diode D3 and the first end of the first resistor R1 are VAD, the voltage at VAD is: VAD = Vout + VD2, where VD2 is the conduction voltage drop of the second diode D2, typically 0.7V. The VAD transmits a high level signal to a Zero-crossing detection terminal Zero pin of the second control module 302, and the second control module 302 detects the high level.
When the alternating current is in a negative half cycle, the current of the live wire terminal 10 is negative, the current of the zero wire terminal 20 is positive, and the detection loop comprises the zero wire terminal 20, the second resistor R2, the third diode D3, the resistor module 3031 and the live wire terminal 10. When the third diode D3 is turned on, based on the second end of the first resistor R1 and the anode of the third diode D3 both being grounded to GND, the voltage at VAD with respect to ground GND is: VAD = GND-VD3= GND-0.7V, i.e., the voltage at VAD is-0.7V with respect to ground, the signal of the pin of the Zero-crossing detection terminal Zero of the corresponding second control module 302 is at a low level.
Therefore, a waveform obtained by circuit simulation corresponding to the Zero-cross detection module 303 in the second control module 302 is as shown in fig. 7, where the upper diagram is an alternating current waveform, and the lower diagram is a waveform detected by the Zero-cross detection terminal Zero pin of the second control module 302. As can be seen from the waveform diagram, when the alternating current is near the Zero-crossing point, the signal detected by the Zero-crossing detection terminal Zero pin is subjected to one high-low level conversion, so that the alternating current can be judged to generate the Zero-crossing signal only by performing level conversion on the signal received by the Zero-crossing detection terminal Zero pin detected by the second control module 302, and the second control module 302 outputs a level signal through the output terminal drive according to the Zero-crossing signal to control the conduction state of the thyristor module 40. The zero-crossing signal is detected by the zero-crossing detection module 303, so that the corresponding level signal is sent to the control end G1 of the thyristor module 40 for conducting control after the alternating current signal crosses zero, thereby avoiding the situation that the thyristor loop is conducted or cut off when the alternating current is at the wave peak or the wave trough, which causes great impact current and impact voltage, easily damages devices and causes harmonic interference, and improving the safety and the anti-interference capability of the thyristor circuit.
The resistance module 3031 includes an eighth resistor R8 and a ninth resistor R9; a first end of the eighth resistor R8 is connected with the live wire terminal 10, and a second end of the eighth resistor R8 is connected with a first end of the ninth resistor R9; a second end of the ninth resistor R9 is connected to an anode of the second diode D2 and a first end of the first resistor R1. The eighth resistor R8 and the ninth resistor R9 are arranged in series to realize the current limiting function so as to protect the circuit.
In an embodiment, the eighth resistor R8 and the ninth resistor R9 in the resistor module 3031 may be connected in parallel. A first end of the eighth resistor R8 and a first end of the ninth resistor R9 are both connected to the hot terminal 10, and a second end of the eighth resistor R8 and a second end of the ninth resistor R9 are both connected to an anode of the second diode D2 and a first end of the first resistor R1.
In an embodiment, the corresponding data amount of the resistors and the serial-parallel connection manner of the resistors in the resistor module 3031 may be set according to actual situations, as long as the current limiting function can be achieved.
In an embodiment, the zero crossing detection module 303 further includes a fourth diode D4; an anode of the fourth diode D4 is connected to the first end of the first resistor R1, and a cathode thereof is connected to the Zero-crossing detection terminal Zero of the second control module 302. When the second diode D2 is turned on, the voltage at VAD is: VAD = Vout +0.7V, where 0.7V is the voltage drop of the second diode D2. Generally, the second control module 302 is an MCU, and the maximum withstand voltage is about Vout +0.5V, so the voltage at VAD exceeds the maximum withstand voltage of the MCU, and the voltage obtained at VAD is directly transmitted to the second control module 302, which is likely to damage the MCU. In order to avoid the voltage entering the second control module 302 being too high, the fourth diode D4 is added to offset the tube voltage drop of the second diode D2, and the voltage of the Zero-cross detection terminal Zero pin finally entering the second control module 302 is Vzero = Vout +0.7V-0.7V = Vout, so as to ensure that the voltage Vzero received by the Zero-cross detection terminal Zero pin of the second control module 302 does not exceed the maximum withstand voltage of the MCU, thereby protecting the second control module 302.
In one embodiment, the zero crossing detection module 303 further includes a third resistor R3 and a second capacitor C2. A first end of the third resistor R3 is connected to the cathode of the fourth diode D4, and a second end thereof is connected to the Zero-crossing detection end Zero of the second control module 302 and the first end of the second capacitor C2; a second terminal of the second capacitor C2 is connected to an anode of a third diode D3. The third resistor R3 and the second capacitor C2 form an RC filter, which reduces the interference of the signal of the Zero-crossing detection terminal Zero of the second control module 302. When the voltage of the tube of the fourth diode D4 is subtracted from the VAD voltage when the diode is matched with the fourth diode D4, the high level signal is filtered by an RC formed by the third resistor R3 and the second capacitor C2 and then transmitted to a Zero-crossing detection end Zero pin of the second control module 302, and the second control module 302 detects the high level.
Fig. 8 is a schematic circuit diagram of the thyristor module 40 according to an embodiment of the present disclosure, where the thyristor module 40 includes a thyristor TR1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a second control switch Q2. A first end of the fourth resistor R4 is connected to the output terminal drive of the second control module 302, and a second end is connected to the first end of the second control switch Q2. The fourth resistor R4 performs a current limiting function to protect the second control switch Q2. The second terminal of the second control switch Q2 is grounded, and the third terminal is connected to the first terminal of the fifth resistor R5. The second control switch Q2 is used for controlling the on and off of the gate G signal of the thyristor TR1. A second end of the fifth resistor R5 is connected to a first end of the sixth resistor R6 and the gate G of the thyristor TR1. A first main electrode T1 of the thyristor TR1 is connected to a second end of the sixth resistor R6 and the neutral terminal 20. The fifth resistor R5 is used to limit the current flowing through the gate G of the thyristor TR1 to protect the thyristor TR1. And the sixth resistor R6 is used for preventing the silicon controlled rectifier TR1 from being triggered mistakenly, and the anti-noise capability of the silicon controlled rectifier TR1 is improved. A second main electrode T2 of the thyristor TR1 is connected to the load 50 module, and the thyristor TR1 is configured to enable the first main electrode T1 and the second main electrode T2 to be turned on according to a level signal received by the control electrode G, so as to supply power to the load 50.
It should be noted that the second control switch Q2 may be any controllable device such as a triode, a MOS transistor, or an IGBT.
The thyristor TR1 can be divided into four quadrants according to the G pole trigger potential of the control pole. Fig. 9 is a schematic view of the operating quadrant of the thyristor, and as shown in fig. 9, when the thyristor TR1 operates in quadrant 1, the driving current flows into the gate G from the outside, and the conduction current flows into the thyristor TR1 from the second main electrode T2. When the thyristor TR1 operates in quadrant 2, a driving current flows out from the control electrode G, and a conduction current flows into the thyristor TR1 from the second main electrode T2. When the thyristor TR1 works in quadrant 3, the driving current flows out from the control electrode G, and the conduction current flows out of the thyristor TR1 from the second main electrode T2. When the thyristor TR1 operates in quadrant 4, a driving current flows in from the control electrode G, and a conduction current flows out of the thyristor TR1 from the second main electrode T2. Due to thyristor TR1 manufacturing process issues, when the thyristor TR1 is operating in quadrant 4, a greater trigger current IG and duration of trigger current are required, and a lower dv/dt withstand capability, as well as the tendency to degrade the gate G. Because of the above, the thyristor TR1 is not normally operated in quadrant 4. Therefore, in order to avoid operating the thyristor TR1 in quadrant 4, the gate G is driven in a negative voltage manner, i.e., a driving current is allowed to flow out from the gate G, so that the thyristor TR1 operates only in quadrant 2 and quadrant 3.
In order to control the silicon controlled rectifier TR1 to work in quadrant 2 and quadrant 3, the negative voltage of the silicon controlled rectifier TR1 is conducted, and therefore the second control switch Q2 is configured as an NPN type triode. The base electrode of the NPN type triode is connected with the second end of the fourth resistor R4, the emitting electrode of the NPN type triode is grounded, and the collecting electrode of the NPN type triode is connected with the first end of the fifth resistor R5. Through the setting, can receive the level signal of second control module 302's output drive transmission at the base of NPN type triode for the collecting electrode and the projecting pole of NPN type triode switch on, silicon controlled rectifier TR 1's drive current flows from the control level G utmost point, and the negative pressure that realizes silicon controlled rectifier TR1 switches on, thereby makes silicon controlled rectifier TR1 work in quadrant 2 or quadrant 3, in order to protect silicon controlled rectifier TR1, improve silicon controlled rectifier TR 1's life, thereby improve silicon controlled rectifier circuit's security and interference killing feature.
In an embodiment, after the second control module 302 detects the zero-crossing signal, a corresponding level signal is sent out through the output terminal drive pin to control the conduction state of the NPN type triode. After the NPN transistor is turned on, the control electrode G of the thyristor TR1 is also turned on. Due to the adoption of the isolation voltage transformation mode, the Vout point can be connected with the zero line terminal 20, so that the controlled silicon TR1 can work in a quadrant 2 and a quadrant 3, and meanwhile, the bidirectional conduction of the controlled silicon TR1 is realized. Since Vout is connected to the first main electrode T1 of the thyristor TR1, the control electrode G of the thyristor TR1 drives the loop as follows: vout → the first main electrode T1 → the control electrode G → the fifth resistor R5 → the NPN type triode → GND, and the loop shows that the current of the control electrode G of the controlled silicon TR1 flows out from the control electrode G, and the path at the moment is equivalent to the external connection of a negative voltage power supply at the control electrode G, so that the controlled silicon TR1 necessarily works in quadrant 2 and quadrant 3, and the problem caused by the work in quadrant 4 is avoided.
In an embodiment, the thyristor module 40 further includes a seventh resistor R7, a first end of the seventh resistor R7 is connected to a second end of the fourth resistor R4, and a second end of the seventh resistor R7 is connected to a second end of the second control switch Q2. The seventh resistor R7 is used for improving the stability of the second control switch Q2 and improving the circuit safety.
Fig. 10 is a second schematic circuit diagram of a thyristor circuit according to an embodiment of the present disclosure, and as shown in fig. 10, the thyristor circuit includes a hot terminal 10, a neutral terminal 20, a rectifier bridge BD1, a field-effect transistor, a transformer TF1, a first diode D1, an electrolytic capacitor E1, a first capacitor C1, a second capacitor C2, a second control module 302, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a second diode D2, a third diode D3, a fourth diode D4, an NPN type triode, and a thyristor TR1. A pin of an alternating current input end 2 of a rectifier bridge BD1 is connected with a zero line terminal 20, a pin of another alternating current input end 3 of the rectifier bridge BD1 is connected with a hot line terminal 10, a pin of a positive output end 1 of the rectifier bridge BD1 is connected with a positive electrode of an electrolytic capacitor E1 and a first pin of a primary side of a transformer TF1, and a pin of a negative output end 4 of the rectifier bridge BD1 is connected with a negative electrode of the electrolytic capacitor E1 and a source electrode of a field effect tube and grounded. The field effect transistor is used for receiving a driving signal PWM, the drain electrode of the field effect transistor is connected with the second pin of the primary side of the transformer TF1, and the field effect transistor is used for enabling the source electrode and the drain electrode to be conducted according to the driving signal PWM received by the gate electrode. The conduction of the primary side of the transformer TF1 can be controlled by the driving signal PWM, and the voltage value of the primary side of the transformer TF1 can be controlled, thereby controlling the voltage value of the voltage output from the secondary side of the transformer TF 1. A third pin of the secondary side of the transformer TF1 is connected to an anode of the first diode D1, a cathode of the first diode D1 is connected to the zero line terminal 20, the first end of the first capacitor C1, and the input terminal VCC of the second control module 302, and a fourth pin of the secondary side of the transformer TF1 is connected to the second end of the first capacitor C1 and the ground terminal GND of the second control module 302. The current on the secondary side of the transformer TF1 flows into the input terminal VCC of the second control module 302 after passing through the first diode D1, so as to supply power to the second control module 302. The first diode D1 is a rectifying diode and functions to prevent a reverse flow of voltage.
It should be noted that the secondary side of the transformer TF1 further includes at least a fifth pin and a sixth pin, which are used for connecting to other control modules to supply power to the other control modules.
The eighth resistor R8 has a first end connected to the hot terminal 10 and a second end connected to the first end of the ninth resistor R9. A second end of the ninth resistor R9 is connected to an anode of the second diode D2, a first end of the first resistor R1, and an anode of the fourth diode D4. The cathode of the second diode D2 is connected to the neutral terminal 20 and the first end of the second resistor R2. The second end of the first resistor R1 is grounded, the second end of the first resistor R1 is connected to the anode of the third diode D3, the second end of the second resistor R2 and the second end of the second capacitor C2, the cathode of the fourth diode D4 is connected to the first end of the third resistor R3, and the second end of the third resistor R3 is connected to the Zero-crossing detection terminal Zero of the second control module 302 and the first end of the second capacitor C2. Second diode D2 and third diode D3 provide a path between hot terminal 10 and neutral terminal 20.
It should be noted that the resistance of the first resistor R1 is much smaller than the resistances of the eighth resistor R8 and the ninth resistor R9. The first resistor R1, the eighth resistor R8 and the ninth resistor R9 are used for voltage division, and a zero-crossing signal is detected.
It should be noted that the resistance of the second resistor R2 is much smaller than the resistances of the eighth resistor R8 and the ninth resistor R9. The second resistor R2 is divided by the eighth resistor R8 and the ninth resistor R9, and a zero-crossing signal is detected.
A first end of the fourth resistor R4 is connected to the output terminal drive of the second control module 302, and a second end thereof is connected to the base of the NPN transistor and the first end of the seventh resistor R7. The fourth resistor R4 performs a current limiting function to protect the second control switch Q2. An emitting electrode of the NPN type triode is connected with a second end of the seventh resistor R7 and is grounded, a collecting electrode of the NPN type triode is connected with a first end of the fifth resistor R5, and a second end of the fifth resistor R5 is connected with a first end of the sixth resistor R6 and a control electrode G of the controlled silicon TR1. A first main electrode T1 of the thyristor TR1 is connected to a second end of the sixth resistor R6 and the neutral terminal 20. The second main electrode T2 of the thyristor TR1 is connected to one end of the load 50, and the other end of the load 50 is connected to the hot terminal 10.
The thyristor TR1 can be driven to work safely and reliably by the thyristor circuit. Through isolation transformer's mode, with zero line terminal 20 and Vout point connection to realize that silicon controlled rectifier TR1 works in quadrant 2 and quadrant 3, play protection silicon controlled rectifier TR 1's effect, simultaneously, also can let load 50 pass through silicon controlled rectifier TR1 bidirectional switch on the power supply. The silicon controlled rectifier circuit can realize zero-crossing detection through few resistors and diodes, and greatly saves cost.
Above-mentioned, through first control module 30 after detecting zero cross signal through output drive transmission level signal for the control end G1 of silicon controlled module 40 to make silicon controlled module 40 first end and second end switch on, thereby supply power for load 50 modules, avoided appearing switching on or cutting off the condition in silicon controlled loop when the alternating current is in crest or trough, promote silicon controlled circuit's security and interference killing feature.
The embodiment of the application also provides electronic equipment which comprises the silicon controlled rectifier circuit.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description of the present invention and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "disposed," "mounted," "connected," "secured," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, and may be interconnected or interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
It is noted that in the present disclosure, unless otherwise explicitly specified or limited, a first feature "on" or "under" a second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (13)
1. A thyristor circuit for supplying power to a load module, comprising: the fire wire terminal, the zero line terminal, the first control module and the silicon controlled module;
the live wire terminal and the zero line terminal are both connected with the input end of the first control module and a zero-crossing detection end, and the zero-crossing detection end is used for detecting a zero-crossing signal of alternating current;
the output end of the first control module is connected with the control end of the controllable silicon module, and the first control module is used for transmitting a level signal to the control end of the controllable silicon module through the output end after detecting a zero-crossing signal;
the first end of the silicon controlled module is connected with the zero line terminal, the second end of the silicon controlled module is connected with the load module, and the silicon controlled module is used for enabling the first end and the second end to be conducted according to the level signal received by the control end.
2. The silicon controlled rectifier circuit according to claim 1, wherein the first control module comprises a driving module, a second control module and a zero-crossing detection module;
the live wire terminal and the zero wire terminal are respectively connected with a first power end and a second power end of the driving module;
the first output end of the driving module is connected with the input end of the second control module, the second output end of the driving module is connected with the grounding end of the second control module, and the fifth end of the driving module is grounded;
the second control module is used for determining a zero-crossing signal according to a current signal received by the zero-crossing detection end;
the live wire terminal is further connected with the second end of the zero-crossing detection module, the third end of the zero-crossing detection module is connected with the zero wire terminal, and the fourth end of the zero-crossing detection module is grounded.
3. The thyristor circuit of claim 2, wherein the drive module comprises a rectifier bridge, a first control switch, a transformer, and a first diode;
two alternating current input ends of the rectifier bridge are respectively connected with the zero line terminal and the live line terminal, a positive electrode output end of the rectifier bridge is connected with a first pin on the primary side of the transformer, and a negative electrode output end of the rectifier bridge is connected with a first end of the first control switch and grounded;
the second end of the first control switch is used for receiving a driving signal, the third end of the first control switch is connected with the second pin of the primary side of the transformer, and the first control switch is used for realizing the conduction of the first end and the third end according to the driving signal;
a third pin on the secondary side of the transformer is connected with the anode of the first diode, and a fourth pin is connected with the grounding end of the second control module;
and the cathode of the first diode is connected with the zero line terminal and the input end of the second control module.
4. The thyristor circuit of claim 3, wherein the first control switch comprises a field effect transistor;
the source electrode of the field effect transistor is connected with the negative electrode output end of the rectifier bridge, the grid electrode of the field effect transistor is used for receiving a driving signal, the drain electrode of the field effect transistor is connected with the second pin of the primary side of the transformer, and the field effect transistor is used for conducting the source electrode and the drain electrode according to the driving signal received by the grid electrode.
5. The thyristor circuit of claim 3, wherein the drive module further comprises an electrolytic capacitor and a first capacitor;
the anode of the electrolytic capacitor is connected with the anode output end of the rectifier bridge, and the cathode of the electrolytic capacitor is connected with the cathode output end of the rectifier bridge;
and the first end of the first capacitor is connected with the cathode of the first diode, and the second end of the first capacitor is connected with the grounding end of the second control module.
6. The thyristor circuit of claim 2, wherein the zero-crossing detection module comprises a resistance module, a first resistor, a second diode, and a third diode;
the first end of the resistance module is connected with the fire wire terminal, and the second end of the resistance module is connected with the anode of the second diode and the first end of the first resistor;
the cathode of the second diode is connected with the zero line terminal and the first end of the second resistor;
the second end of the first resistor is connected with the anode of the third diode, the second end of the second resistor and the zero-crossing detection end of the second control module and is grounded;
and the cathode of the third diode is connected with the first end of the first resistor and the zero-crossing detection end of the second control module.
7. The thyristor circuit of claim 6, wherein the zero-crossing detection module further comprises a fourth diode;
and the anode of the fourth diode is connected with the first end of the first resistor, and the cathode of the fourth diode is connected with the zero-crossing detection end of the second control module.
8. The thyristor circuit of claim 7, wherein the zero-crossing detection module further comprises a third resistor and a second capacitor;
a first end of the third resistor is connected with a cathode of the fourth diode, and a second end of the third resistor is connected with a zero-crossing detection end of the second control module and a first end of the second capacitor;
the second end of the second capacitor is connected with the anode of the third diode.
9. The thyristor circuit of claim 1, wherein the thyristor module comprises a thyristor, a fourth resistor, a fifth resistor, a sixth resistor, and a second control switch;
the first end of the fourth resistor is connected with the output end of the first control module, and the second end of the fourth resistor is connected with the first end of the second control switch;
the second end of the second control switch is grounded, the third end of the second control switch is connected with the first end of the fifth resistor, and the second control switch controls the conduction of the second end and the third end according to a signal received by the first end;
the second end of the fifth resistor is connected with the first end of the sixth resistor and the control electrode of the controllable silicon;
a first main electrode of the controlled silicon is connected with a second end of the sixth resistor and the zero line terminal;
and the second main electrode of the controllable silicon is connected with the load module, and the controllable silicon is used for conducting the first main electrode and the second main electrode according to the level signal received by the control electrode.
10. The thyristor circuit of claim 9, wherein the second control switch comprises an NPN transistor;
and the base electrode of the NPN type triode is connected with the second end of the fourth resistor, the emitting electrode of the NPN type triode is grounded, and the collector electrode of the NPN type triode is connected with the first end of the fifth resistor.
11. The thyristor circuit of claim 9, wherein the thyristor module further comprises a seventh resistor;
the first end of the seventh resistor is connected with the second end of the fourth resistor;
a second end of the seventh resistor is connected to a second end of the second control switch.
12. The thyristor circuit of claim 6, wherein the resistance module comprises an eighth resistor and a ninth resistor;
the first end of the eighth resistor is connected with the fire wire terminal, and the second end of the eighth resistor is connected with the first end of the ninth resistor;
and the second end of the ninth resistor is connected with the anode of the second diode and the first end of the first resistor.
13. An electronic device comprising a thyristor circuit as claimed in any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222392498.3U CN218633892U (en) | 2022-09-06 | 2022-09-06 | Silicon controlled rectifier circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222392498.3U CN218633892U (en) | 2022-09-06 | 2022-09-06 | Silicon controlled rectifier circuit and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218633892U true CN218633892U (en) | 2023-03-14 |
Family
ID=85466274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222392498.3U Active CN218633892U (en) | 2022-09-06 | 2022-09-06 | Silicon controlled rectifier circuit and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218633892U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117176126A (en) * | 2023-11-02 | 2023-12-05 | 江苏捷捷微电子股份有限公司 | Multifunctional silicon controlled rectifier |
-
2022
- 2022-09-06 CN CN202222392498.3U patent/CN218633892U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117176126A (en) * | 2023-11-02 | 2023-12-05 | 江苏捷捷微电子股份有限公司 | Multifunctional silicon controlled rectifier |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101715265A (en) | LED driving power supply control circuit and LED lamp by using same | |
| CN103326325A (en) | Short-circuit and low-voltage protective circuit of output of switching power source | |
| CN203537225U (en) | Novel antisurge constant-current switching power supply | |
| CN218633892U (en) | Silicon controlled rectifier circuit and electronic equipment | |
| CN103227628A (en) | IGBT (Insulated Gate Bipolar Transistor) drive module for electric automobile | |
| CN109510176A (en) | A kind of intelligent power module Drive Protecting Circuit | |
| CN208656639U (en) | Control circuit and switch converters for switch converters | |
| CN111884536A (en) | Intelligent power module | |
| CN116780887B (en) | Intelligent power module with drive resistor selection function | |
| CN207782395U (en) | A kind of thermal-shutdown circuit and electronic equipment | |
| CN202930915U (en) | Short circuit protection device of frequency converter switch power supply | |
| CN203193500U (en) | Switching power supply and charging loop thereof | |
| CN102810986A (en) | Series topological light-emitting diode (LED) switching power circuit | |
| CN102064719A (en) | LED (Light Emitting Diode) backlight power source circuit, backlight power source and multimedia device | |
| CN201869101U (en) | Isolating drive circuit | |
| CN202652136U (en) | Alternating current fan control circuit | |
| TWI699062B (en) | Power module having wide-bandgap power switch | |
| CN203312774U (en) | Short-circuit and low-voltage protective circuit of output of switching power source | |
| CN113098255B (en) | High-working-voltage and low-power switching power supply circuit | |
| CN220896521U (en) | SiC MOSFET driving circuit | |
| CN101854765B (en) | Ballast with automatic regulation of over-current protection point and lighting fixture thereof | |
| CN216313061U (en) | Silicon controlled rectifier driving device | |
| CN209709933U (en) | A kind of high frequency switch power IGBT drive circuit | |
| CN218648570U (en) | Short-circuit protection circuit of switching power supply | |
| CN219475718U (en) | Zero-crossing detection circuit and silicon controlled rectifier voltage stabilizing equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |