CN118137798B - Constant temperature control's thyristor current sharing circuit - Google Patents
Constant temperature control's thyristor current sharing circuit Download PDFInfo
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- CN118137798B CN118137798B CN202410544150.2A CN202410544150A CN118137798B CN 118137798 B CN118137798 B CN 118137798B CN 202410544150 A CN202410544150 A CN 202410544150A CN 118137798 B CN118137798 B CN 118137798B
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- 230000008569 process Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 230000001960 triggered effect Effects 0.000 abstract description 2
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- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000017525 heat dissipation Effects 0.000 description 4
- 101000668165 Homo sapiens RNA-binding motif, single-stranded-interacting protein 1 Proteins 0.000 description 3
- 102100039692 RNA-binding motif, single-stranded-interacting protein 1 Human genes 0.000 description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/06—Circuits specially adapted for rendering non-conductive gas discharge tubes or equivalent semiconductor devices, e.g. thyratrons, thyristors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention discloses a constant temperature controlled thyristor current equalizing circuit, which consists of a thyristor parallel circuit, a push-pull circuit configured for each thyristor, a capacitor, a temperature sensor and an adjusting module; when the thyristor is overheated, the output voltage of the temperature sensor is larger than the reference voltage, the adjusting module is triggered, and when the adjusting module outputs a high level, a part of base current of a triode in the thyristor is shunted into the capacitor, so that the current flowing into the base of the triode in the thyristor is gradually reduced, and the triode in the thyristor exits from the saturation region and enters into the amplifying region; when the adjustment module outputs low level, the two ends of the capacitor are short-circuited, and the state of zero voltage is restored; the amount of current extracted from the gate electrode of the thyristor can be controlled by the frequency of the square wave signal sent by the adjusting module, the higher the frequency is, the more the extracted current is, the smaller the current flowing through the thyristor is, so that the heating value of the thyristor is reduced, and after the heating value of the thyristor is reduced to a preset level, the thyristor stops outputting, thereby ensuring that the system is in a high-efficiency state.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a constant-temperature controlled thyristor current equalizing circuit.
Background
The silicon controlled rectifier (Silicon Controlled Rectifier) is called SCR for short, which is a high-power electrical element, also called thyristor. It has the advantages of small volume, high efficiency, long service life, etc. Because of the positive feedback mechanism formed by the internal structure of the thyristor, the thyristor can quickly enter a current saturation state after receiving a gate electrode conducting signal.
Parameters of P, N doped layers inside different thyristors are also different, so that equivalent resistances of the thyristors are also different in a current saturation state of the thyristors, and the equivalent resistances are one of the parameters; when a plurality of thyristors are connected in parallel, the thyristors which are firstly turned on enter a saturated state more quickly due to the fact that time difference exists between the received trigger signals, and the two thyristors are the second thyristors; since the load on the high-voltage bus cannot be determined, the voltage of the high-voltage bus should be kept stable, and when a plurality of thyristors are connected to the high-voltage bus in parallel to be used as a switch, the phenomenon of unbalanced current is unavoidable, which is three.
Because of the difference, the heat generation amounts of different thyristors are not equal, and therefore, when the thyristor parallel circuit is in a conductive state for a long period of time, the thyristor with a larger heat generation amount is burned. In the existing method, or the method for inhibiting the overlarge heating value of the thyristor, the measures adopted mainly are to increase the external heat dissipation capacity and reduce the high-voltage bus current; or the heat dissipation allowance is reserved as far as possible, and the maximum load current of the thyristor is used as a calculation assumption; however, the existing method increases the weight of the radiator of the thyristor, increases the equipment cost, accelerates the aging of the thyristor when the heating is unbalanced, and reduces the reliability of the equipment.
Disclosure of Invention
The invention aims to provide a constant-temperature controlled thyristor current sharing circuit, which is based on a current sharing measure of heating temperature, so that bus current is distributed in each parallel thyristor as uniformly as possible, the heat dissipation requirement of a single thyristor is reduced, the equipment reliability is improved, the technical scheme of the invention can be flexibly configured, and the increase of the number of parallel branches does not influence the current sharing reliability.
The invention is realized by adopting the following technical scheme:
The thyristor current equalizing circuit comprises a thyristor parallel circuit which is connected with a high-voltage loop after at least two thyristors are connected in parallel; each thyristor is configured with the following circuitry:
The push-pull circuit comprises an emitter of an NPN triode and an emitter of a PNP triode, wherein a collector of the NPN triode is connected with an input of a thyristor, the collector of the PNP triode is grounded, and a base of the NPN triode and a base of the PNP triode are connected to form an input of the push-pull circuit;
the capacitor is connected with the PNP triode of the push-pull circuit in parallel;
The temperature sensor is arranged close to the thyristor and used for detecting the temperature of the thyristor;
the adjusting module is used for outputting a square wave signal with a variable period when the temperature of the thyristor exceeds a preset value so as to control the push-pull circuit to charge and discharge the capacitor; the first input end of the temperature sensor is connected with a reference voltage, the second input end of the temperature sensor is connected with the output of the temperature sensor, and the output end of the temperature sensor is connected with the input of the push-pull circuit; the reference voltage is a voltage output when the temperature detected by the temperature sensor is at a preset value.
In some embodiments of the present invention, the adjustment module is composed of an enable circuit, a PI adjustment circuit, and a square wave generation circuit;
The enabling circuit outputs a high level or a low level based on a reference voltage and a temperature sensor detection voltage and is used for enabling or disabling the square wave generating circuit;
the PI adjusting circuit outputs an adjusting voltage based on the reference voltage and the detected voltage of the temperature sensor;
the square wave generating circuit outputs a square wave signal based on the adjustment voltage output by the PI adjustment circuit; wherein the adjustment voltage determines the period of the square wave signal.
In some embodiments of the invention, the adjustment module further comprises:
The delay circuit is controlled by the enabling circuit to be enabled or disabled; and after controlled enabling, maintaining the current output adjusting voltage of the PI adjusting circuit until the next adjusting period.
In some embodiments of the present invention, the PI adjustment circuit is formed by connecting a first subtraction circuit, an integration operation circuit and a second subtraction circuit in series; the two input ends of the square wave generator are respectively connected with the output of the reference voltage and the output of the temperature sensor, and the output end of the square wave generator is connected with the input of the square wave generator;
The square wave generating circuit consists of a first charge-discharge circuit, a first comparator, a second comparator, a first RS trigger, a first NAND gate and a first NAND gate; the output of the PI regulating circuit is connected with the same-phase end of the first comparator; the reverse end of the first comparator and the in-phase end of the second comparator are connected with a first charge-discharge circuit; the output of the first comparator and the output of the second comparator are the input of a first RS trigger, the output of the first RS trigger is one input of a first NAND gate, and the output of the enabling circuit is the other input of the first NAND gate; the output of the first NAND gate is the input of the first NAND gate, and the output of the first NAND gate is connected with the input of the push-pull circuit; the first charge-discharge circuit controls the discharge and charge process by the on and off of a third NPN triode, the emitter of the third NPN triode is grounded, and the base of the third NPN triode is connected with the output of the first NAND gate.
In some embodiments of the present invention, the first charge-discharge circuit is composed of a first resistor, a second resistor, a third diode, a fourth diode, a third capacitor and a third NPN transistor; the second resistor is connected with a fourth diode in series to form a third branch, and the cathode of the fourth diode is connected with the second resistor; the anode of the third capacitor is connected with the anode of the fourth diode by a second resistor; one end of the first resistor is connected with a power supply, and the other end of the first resistor is connected with the anodes of the second resistor and the third diode; the other end of the third capacitor is grounded; the third capacitor discharging end is connected with the reverse end of the first comparator and the same-phase end of the second comparator; the anodes of the second resistor and the third diode are also connected with the collector electrode of the third NPN triode.
In some embodiments of the present invention, the first resistor and the second resistor have equal resistance values, so that the square wave generating circuit outputs a square wave with a duty cycle of 50%.
In some embodiments of the present invention, the delay circuit is composed of a second charge-discharge circuit, a third comparator, a fourth comparator, a second RS flip-flop, a second nand gate, a second not gate, a first push-pull circuit composed of a first NPN triode and a second PNP triode, a first PNP triode and a first capacitor; the first PNP triode is connected in parallel with the first capacitor, the base electrode of the first PNP triode is connected with the output of the enabling circuit, and one end of the first capacitor connected with the collector electrode of the first PNP triode is grounded; one end of the first capacitor, which is connected with the emitter of the first PNP triode, is connected between the emitter of the first NPN triode and the emitter of the second PNP triode; the bases of the first NPN triode and the second PNP triode are connected with the output of the PI regulating circuit, and the collector of the second PNP triode is connected with the same-phase end of the third comparator; the reverse end of the third comparator and the in-phase end of the fourth comparator are connected with a second charge-discharge circuit; the output of the third comparator and the fourth comparator is the input of a second RS trigger, the output of the second RS trigger is one input of a second NAND gate, and the output of the enabling circuit is the other input of the second NAND gate; the output of the second NAND gate is the input of the second NAND gate, and the output of the second NAND gate is connected with the bases of the first NPN triode and the second PNP triode; the second charge-discharge circuit controls the discharge and charge process by the on and off of a second NPN triode, the emitter of the second NPN triode is grounded, and the base of the second NPN triode is connected with the output of the second NAND gate.
In some embodiments of the present invention, the second charge-discharge circuit is composed of a first potentiometer, a second potentiometer, a first diode, a second capacitor and a second NPN triode; the first potentiometer is connected with the first diode in series to form a first branch, and the anode of the first diode is connected with the first potentiometer; the second potentiometer is connected with the second diode in series to form a second branch, and the cathode of the second diode is connected with the second potentiometer; the first branch is connected in parallel with the second branch and then connected in series with a second capacitor, and the other end of the second capacitor is grounded; the second capacitor discharging end is connected with the reverse end of the third comparator and the same-phase end of the fourth comparator; the other ends of the first potentiometer and the second potentiometer are connected with a power supply and a collector electrode of the second NPN triode.
In some embodiments of the present invention, the first potentiometer and the second potentiometer are adjustable to change the charge and discharge time of the second capacitor.
In some embodiments of the invention, the enabling circuit is a comparator.
Compared with the prior art, the invention has the advantages and positive effects that: according to the constant-temperature control thyristor current equalizing circuit, when the thyristor is overheated, the output voltage of the temperature sensor is larger than the reference voltage, the adjusting module is triggered, and when the adjusting module outputs a high level, the NPN triode in the push-pull circuit is conducted, so that part of base current of the NPN triode in the thyristor is shunted into the capacitor, and as the current flowing into the base of the NPN triode in the thyristor is gradually reduced, the base current of the PNP triode is also reduced, and then the triode in the thyristor exits from a saturation region and enters an amplifying region, namely a current controlled state; when the adjusting module outputs a low level, a PNP triode in the push-pull circuit is conducted, so that two ends of the capacitor are short-circuited, and the state of zero voltage is restored; the amount of current extracted from the gate electrode of the thyristor can be controlled by the frequency of the square wave signal sent by the adjusting module, the higher the frequency is, the more the extracted current is, the smaller the current flowing through the thyristor is, so that the heating value of the thyristor is reduced, and after the heating value of the thyristor is reduced to a preset level, the thyristor stops outputting, thereby ensuring that the system is in a high-efficiency state.
Further, due to the thermal inertia phenomenon, the change of the output voltage value of the temperature sensor is delayed from the actual temperature change of the surface of the thyristor, the real-time calculated adjustment voltage is smaller, and in order to eliminate the risk of unstable system caused by excessive adjustment, after the current adjustment voltage is calculated, the current adjustment voltage is based on the action of a delay circuit, and the thyristor current can be adjusted until the next adjustment period based on the adjustment voltage in the next period of time; the adjustment period can be controlled according to the adjustment of the first potentiometer and the second potentiometer, namely, the duty ratio of the square wave of the delay current output is controlled according to the resistance values of the first potentiometer and the second potentiometer.
Furthermore, based on the current equalizing circuit provided by the invention, each thyristor realizes implementation adjustment according to heating conditions, ensures equal heating values of thyristors connected in parallel, prolongs the service life of the thyristors, reduces the heat dissipation requirement of the thyristors serving as electronic switches on a high-voltage bus, and is simple and reliable and can be applied as a modularized basic unit.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention, without limitation to the invention. It is evident that the figures in the following description are only examples, from which other figures can be obtained, without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a constant temperature controlled thyristor current sharing circuit according to the present invention;
Fig. 2 is a schematic structural diagram of an adjustment module in the current equalizing circuit according to the present invention;
Fig. 3 is a schematic diagram of a specific circuit embodiment of an adjustment module in the current equalizing circuit according to the present invention;
Fig. 4 is a schematic diagram of another structure of the adjustment module in the current equalizing circuit according to the present invention;
fig. 5 is a schematic diagram of another embodiment of an adjusting module in the current equalizing circuit according to the present invention;
fig. 6 is a waveform schematic diagram of a current equalizing circuit according to the present invention.
It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
The constant-temperature-control thyristor current equalizing circuit provided by the embodiment of the invention, as shown in fig. 1, comprises a parallel circuit which is formed by connecting a thyristor SCR1 and an SCR2 in parallel and then connecting into a high-voltage loop, wherein the SCR1 is provided with a push-pull circuit consisting of an NPN triode N1 and a PNP triode P1, a capacitor C1, a temperature sensor T1 and an adjusting module ADJ1; the SCR2 is provided with a push-pull circuit consisting of an NPN triode N2 and a PNP triode P2, a capacitor C2, a temperature sensor T2 and an adjusting module ADJ2.
The gate of the SCR1 is connected with the cathode of the diode D1, the gate of the SCR2 is connected with the cathode of the diode D2, and G is the gate control end of the thyristor; the anodes of the two diodes are connected to G (ground). The collector of N1 is connected with the cathode of D1, the collector of N2 is connected with the cathode of D1, the emitter of N1 is connected with the emitter of P1, the emitter of N2 is connected with the emitter of P2, the collectors of P1 and P2 are connected with GND, C1 is connected with P1 in parallel, C2 is connected with P2 in parallel, the base of N1 is connected with the base of P1, the base of N2 is connected with the base of P2, the output end of ADJ1 is connected with the bases of N1 and P1, the output end of ADJ2 is connected with the bases of N2 and P2, T1 is arranged close to H1, T2 is arranged close to H2, and H1 and H2 are thyristors back-to-back heat sinks; t1, H1 and T2, H2 are arranged as mirror images as possible to improve the accuracy of the system. The output end of the T1 is connected with the input end of the ADJ1, the output end of the T2 is connected with the input end of the ADJ2, the other input ends of the ADJ1 and the ADJ2 are connected with Vref, vref is a reference voltage, and the reference voltage is a voltage output when the temperature detected by the temperature sensor is at a preset value.
N1 and P1 (N2 and P2) form a push-pull circuit, ADJ1 (ADJ 2) outputs a square wave signal with a variable period, and the push-pull circuit is controlled to charge and discharge the capacitor C1/C2, so that a charge pump function is realized.
The ADJ1 is used for outputting a square wave signal with a variable period when the temperature of the SCR1 exceeds a preset value, the N1 of the push-pull circuit is controlled to be conducted when the square wave signal is in a high level, a part of base current of an NPN triode in the SCR1 is shunted into the capacitor C1, the N1 is cut off when the square wave signal is in a low level, the P1 is conducted, two ends of the capacitor C1 are short-circuited, and the zero voltage state is restored. Because the current flowing into the base electrode of the NPN triode in the SCR1 is gradually reduced, the current of the base electrode of the PNP triode is also reduced, and then the triode in the SCR1 exits from the saturation region and enters into the amplifying region, the current flowing through the SCR1 is reduced to reduce the heating value of the triode, and after the heating value of the SCR1 is reduced to a preset level, the ADJ1 stops outputting. ADJ2 is the same.
The adjusting module can be realized based on FPGA and integrated chip combined with software design, and also can be realized by a hardware circuit, such as the specific circuit embodiment of the adjusting module ADJ1/ADJ2 shown in FIG. 2, and the adjusting module consists of an enabling circuit, a PI adjusting circuit delay circuit and a square wave generating circuit. The enabling circuit outputs a high level or a low level based on the reference voltage Vref and the temperature sensor detection voltage Vin and is used for enabling or stopping the square wave generating circuit; the PI regulating circuit outputs a regulating voltage U03 based on the reference voltage Vref and the detection voltage Vin of the temperature sensor; the square wave generating circuit outputs a square wave signal VO2 based on the adjusting voltage U03 output by the PI adjusting circuit, and the adjusting voltage U03 determines the period/frequency of the square wave signal VO 2.
The specific circuit implementation is shown in fig. 3, and the meanings of the parameters in the figure are as follows:
vref: a reference temperature voltage;
Vin: detecting voltage by a temperature sensor;
r: a resistor;
C: a capacitor;
D: a diode;
RP: a potentiometer;
U: an operational amplifier;
N: an NPN triode;
p: PNP type triode;
AN: a NAND gate circuit;
NG: a NOT circuit;
The enabling circuit is composed of an amplifier U0, vref is connected with an inverting terminal, vin is connected with an in-phase terminal, when Vref is greater than Vin, the U0 outputs a low level, and when Vref is less than Vin, the U0 outputs a high level.
The PI adjusting circuit is composed of U1, U2, U3 and peripheral circuits thereof, wherein U1, R0, R1, R2 and R3 form a subtracting circuit, U2, R4, R5, R6 and C0 form an integrating circuit, and U3, R7, R8, R9 and R10 form a subtracting circuit. U1, U2 and their peripheral circuits actually PI adjust for the errors of Vref and Vin.
The transfer function of the system consisting of U1, U2 and U3 is f(s) =Vcc- [ Kp (Vin-Vref) +Ki/s (Vin-Vref) ], wherein Kp and Ki depend on the parameters of a resistance-capacitance system connected with U1, U2 and U3.
In the square wave generating circuit, a charge and discharge circuit is formed by R11, R12, D3, D4, C3 and N3, the resistance values of R11 and R12 are the same, the charge and discharge speeds of C3 are the same, and when the voltage of the same-phase end of U52 is fixed, VO2 outputs square waves with the duty ratio of 50%.
When Vref > Vin, U0 outputs low level, AN55 outputs is locked at high level, NG51 outputs is locked at low level, and the adjustment module outputs low level.
When Vref < Vin, U0 outputs high level, AN RS trigger formed by AN53 and AN54 is enabled, VO2 outputs square wave with duty ratio of 50%, the smaller the deviation between Vin and Vref is, the higher the output voltage of Uo3 is, the lower the frequency of VO2 outputs square wave is, and the current split from the thyristor is less; the larger the deviation of Vin and Vref is, the lower the Uo3 output voltage is, the higher the frequency of Vo2 output square waves is, the more current is shunted from the thyristor, and the more the heating value of the thyristor is reduced.
In the specific circuit embodiment of the adjusting module ADJ1/ADJ2 shown in fig. 4, the adjusting module further comprises a delay circuit, which is controlled by the enabling circuit to be enabled or disabled, and keeps the adjusting voltage currently output by the PI adjusting circuit until the next adjusting period after the enabling circuit is controlled; specific circuit implementation is shown in fig. 5, in the delay circuit, a charge-discharge circuit is formed by RP1, RP2, D1, D2, C2 and N2, and P1, N1, P2 and C2 are used for storing the output U03 of the PI regulating circuit in C1, so that the delay acts on the square wave generating circuit; the values of RP1 and RP2 can be adjusted, and the values are used for controlling the duty ratio of the square wave output by the VO1, increasing the RP2 can prolong the discharging time of the C2, the time of the low level of the VO1 can be prolonged, the charging time of the C2 can be prolonged by increasing the RP1, and the time of the high level of the VO1 can be prolonged.
When Vref > Vin, U0 outputs low level, AN53, AN55 outputs are locked at high level, NG50, NG51 outputs are locked at low level, P1 is turned on, the voltage across C1 is 0, N1 is turned off.
When Vref < Vin, P1 is off, and Vo1 and Vo2 start to change. Because of thermal inertia, the change of the output voltage value of the temperature sensor is delayed from the actual temperature change of the surface of the thyristor, the real-time calculated adjustment value is smaller, in order to eliminate the risk of unstable system caused by excessive adjustment, after the current adjustment value is calculated, the thyristor current can be adjusted based on the adjustment value for a period of time, the voltage at the two ends of C2 is changed between 1/3Vcc and 2/3Vcc, and Vo1 is output as a square wave with variable duty ratio and frequency.
When Vo1 is at high level, N1 is conducted, C1 is charged to Uo3, namely the voltage at the C1 terminal is the calculation result of the front-stage PI regulating circuit. When N1 is cut off, the voltage at the C1 end is inversely proportional to the frequency of the square wave output by Vo2, and Vref and Vin are combined, namely, the smaller the deviation between Vin and Vref is, the higher the output voltage of Uo3 is, and the lower the frequency of the square wave output by Vo2 is.
As shown in the waveform schematic diagram of the current equalizing circuit in FIG. 6, before the time t0, the sensor measures that the temperature is smaller than the reference temperature Vref in real time, U0 outputs low level, vo1 and Vo2 both output low level, and the system is open-loop. At the time t 0-t 1, the sensor measures the temperature in real time to exceed the reference temperature, vo1 starts to output square waves, when Vo1 outputs a high level, N1 is conducted, the terminal voltage of C1 is an adjustment value output by a PI system, at the time t 1-t 2, vo2 outputs square waves with specific frequency and duty ratio of 0.5 according to the terminal voltage of C1 at the time t 1; from time t0, the current in the SCR begins to be drawn. At time t2, the difference between Vref and Vin is further increased, more current is required to be extracted from the SCR by the system, the voltage at the C2 end is reduced, the square wave frequency output by Vo2 is increased, and the current extracted from the SCR is increased at times t 2-t 3; at time t6, the SCR temperature is reduced to be lower than the reference temperature, U0 outputs a low level, vo1 and Vo2 outputs are reset to be low level, and the system is opened. In the figure, f_vo2 is the frequency of Vo2, and i_dec is the detection current.
It should be noted that the above description is not intended to limit the invention, but rather the invention is not limited to the above examples, and that variations, modifications, additions or substitutions within the spirit and scope of the invention will be within the scope of the invention.
Claims (10)
1. A constant temperature controlled thyristor current equalizing circuit comprises a thyristor parallel circuit which is connected with a high voltage loop after at least two thyristors are connected in parallel; characterized in that each thyristor is configured as a circuit:
The push-pull circuit comprises an emitter of an NPN triode and an emitter of a PNP triode, wherein a collector of the NPN triode is connected with an input of a thyristor, the collector of the PNP triode is grounded, and a base of the NPN triode and a base of the PNP triode are connected to form an input of the push-pull circuit;
the capacitor is connected with the PNP triode of the push-pull circuit in parallel;
The temperature sensor is arranged close to the thyristor and used for detecting the temperature of the thyristor;
the adjusting module is used for outputting a square wave signal with a variable period when the temperature of the thyristor exceeds a preset value so as to control the push-pull circuit to charge and discharge the capacitor; the first input end of the temperature sensor is connected with a reference voltage, the second input end of the temperature sensor is connected with the output of the temperature sensor, and the output end of the temperature sensor is connected with the input of the push-pull circuit; the reference voltage is a voltage output when the temperature detected by the temperature sensor is at a preset value.
2. The constant temperature controlled thyristor current sharing circuit according to claim 1, wherein the adjustment module is composed of an enabling circuit, a PI adjustment circuit and a square wave generating circuit;
The enabling circuit outputs a high level or a low level based on a reference voltage and a temperature sensor detection voltage and is used for enabling or disabling the square wave generating circuit;
the PI adjusting circuit outputs an adjusting voltage based on the reference voltage and the detected voltage of the temperature sensor;
the square wave generating circuit outputs a square wave signal based on the adjustment voltage output by the PI adjustment circuit; wherein the adjustment voltage determines the period of the square wave signal.
3. The thermostatically controlled thyristor current sharing circuit as recited in claim 2, wherein the adjustment module further comprises:
The delay circuit is controlled by the enabling circuit to be enabled or disabled; and after controlled enabling, maintaining the current output adjusting voltage of the PI adjusting circuit until the next adjusting period.
4. The constant temperature controlled thyristor current sharing circuit according to claim 2, wherein the PI adjustment circuit is formed by connecting a first subtracting operation circuit, an integrating operation circuit and a second subtracting operation circuit in series; the two input ends of the square wave generator are respectively connected with the output of the reference voltage and the output of the temperature sensor, and the output end of the square wave generator is connected with the input of the square wave generator;
The square wave generating circuit consists of a first charge-discharge circuit, a first comparator, a second comparator, a first RS trigger, a first NAND gate and a first NOT gate; the output of the PI regulating circuit is connected with the same-phase end of the first comparator; the reverse end of the first comparator and the in-phase end of the second comparator are connected with a first charge-discharge circuit; the output of the first comparator and the output of the second comparator are the input of a first RS trigger, the output of the first RS trigger is one input of a first NAND gate, and the output of the enabling circuit is the other input of the first NAND gate; the output of the first NAND gate is the input of the first NAND gate, and the output of the first NAND gate is connected with the input of the push-pull circuit; the first charge-discharge circuit controls the discharge and charge process by the on and off of a third NPN triode, the emitter of the third NPN triode is grounded, and the base of the third NPN triode is connected with the output of the first NAND gate.
5. The thermostatically controlled thyristor current sharing circuit as claimed in claim 4, wherein the first charge-discharge circuit is comprised of a first resistor, a second resistor, a third diode, a fourth diode, a third capacitor and a third NPN transistor; the second resistor is connected with a fourth diode in series to form a third branch, and the cathode of the fourth diode is connected with the second resistor; the third diode is connected with the third branch in parallel and then is connected with a third capacitor, the anode of the third diode is connected with the second resistor, and the cathode of the third diode is connected with the anode of the fourth diode; one end of the first resistor is connected with a power supply, and the other end of the first resistor is connected with the anodes of the second resistor and the third diode; the other end of the third capacitor is grounded; the third capacitor discharging end is connected with the reverse end of the first comparator and the same-phase end of the second comparator; the anodes of the second resistor and the third diode are also connected with the collector electrode of the third NPN triode.
6. The thermostatic thyristor current sharing circuit according to claim 5, wherein the first resistor and the second resistor have equal resistance values for enabling the square wave generating circuit to output a square wave with a duty cycle of 50%.
7. The constant temperature controlled thyristor current sharing circuit according to claim 3, wherein the delay circuit is composed of a second charge-discharge circuit, a third comparator, a fourth comparator, a second RS trigger, a second nand gate, a second not gate, a first push-pull circuit composed of a first NPN triode and a second PNP triode, a first PNP triode and a first capacitor; the first PNP triode is connected in parallel with the first capacitor, the base electrode of the first PNP triode is connected with the output of the enabling circuit, and one end of the first capacitor connected with the collector electrode of the first PNP triode is grounded; one end of the first capacitor, which is connected with the emitter of the first PNP triode, is connected between the emitter of the first NPN triode and the emitter of the second PNP triode; the collector electrode of the second PNP triode is connected with the square wave generating circuit; the reverse end of the third comparator and the in-phase end of the fourth comparator are connected with a second charge-discharge circuit; the output of the third comparator and the fourth comparator is the input of a second RS trigger, the output of the second RS trigger is one input of a second NAND gate, and the output of the enabling circuit is the other input of the second NAND gate; the output of the second NAND gate is the input of the second NAND gate, and the output of the second NAND gate is connected with the bases of the first NPN triode and the second PNP triode; the second charge-discharge circuit controls the discharge and charge process by the on and off of a second NPN triode, the emitter of the second NPN triode is grounded, and the base of the second NPN triode is connected with the output of the second NAND gate.
8. The thermostatically controlled thyristor current sharing circuit of claim 7, wherein the second charge-discharge circuit is comprised of a first potentiometer, a second potentiometer, a first diode, a second capacitor and a second NPN triode; the first potentiometer is connected with the first diode in series to form a first branch, and the anode of the first diode is connected with the first potentiometer; the second potentiometer is connected with the second diode in series to form a second branch, and the cathode of the second diode is connected with the second potentiometer; the first branch is connected in parallel with the second branch and then connected in series with a second capacitor, and the other end of the second capacitor is grounded; the second capacitor discharging end is connected with the reverse end of the third comparator and the same-phase end of the fourth comparator; the other ends of the first potentiometer and the second potentiometer are connected with a power supply and a collector electrode of the second NPN triode.
9. The thermostatically controlled thyristor current sharing circuit of claim 8, wherein the first potentiometer and the second potentiometer are adjustable to vary the charge-discharge time of the second capacitor.
10. The thermostatically controlled thyristor current sharing circuit of claim 2, wherein the enabling circuit is a comparator.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602647A (en) * | 2016-12-14 | 2017-04-26 | 华南理工大学 | Two-way nondestructive equalization circuit of parallel battery packs based on capacitive energy storage |
| CN106655822A (en) * | 2016-12-27 | 2017-05-10 | 上海新时达电气股份有限公司 | Frequency converter control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU539359A1 (en) * | 1974-02-12 | 1976-12-15 | Научно-Исследовательский Институт Постоянного Тока | Device for controlling parallel-connected thyristors |
| CN204794047U (en) * | 2015-07-29 | 2015-11-18 | 佛山市顺德区美的电热电器制造有限公司 | Thyristor overvoltage crowbar and electromagnetic heating's electrical apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106602647A (en) * | 2016-12-14 | 2017-04-26 | 华南理工大学 | Two-way nondestructive equalization circuit of parallel battery packs based on capacitive energy storage |
| CN106655822A (en) * | 2016-12-27 | 2017-05-10 | 上海新时达电气股份有限公司 | Frequency converter control circuit |
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