CN217563548U - Multifunctional rectification control circuit - Google Patents

Abstract

The utility model provides a multi-functional rectification control circuit relates to switched reluctance motor technical field. This multi-functional rectification control circuit includes: the brake control circuit comprises a multi-path power supply, a protection circuit and a brake discharging and rectifying detection circuit, wherein the rectifying detection circuit is respectively connected to the multi-path power supply and the brake discharging circuit through a 500V direct-current voltage circuit, the multi-path power supply is responsible for providing direct-current logic voltage of the whole circuit board, and meanwhile, 10 control signals including control signals SENSOR1- - -PBE1 from brake discharging are connected to the protection circuit for control. The multifunctional rectification control circuit forms a single-ended flyback switching power supply by using a UC2844 chip as a PWM (pulse-width modulation) main control chip and using a field-effect transistor IGB03N120H2 as a switching tube through a multi-path power supply. The power supply outputs generate 24V,5V, -1.3V and an isolated 24V voltage. Sampling adjustment is carried out on the output 24V direct-current voltage, and a TL431 reference chip and an optical coupler MOC8102 are selected as a sampling circuit to jointly complete sampling feedback.

Description

Multifunctional rectification control circuit

Technical Field

The utility model relates to a switched reluctance motor technical field specifically is a multi-functional rectification control circuit.

Background

The switched reluctance motor speed regulation system is a latest generation stepless speed regulation system developed after a variable frequency speed regulation system and a brushless direct current motor speed regulation system, is an optical, mechanical and electrical integration high and new technology integrating modern microelectronic technology, digital technology, power electronic technology, infrared photoelectric technology, modern electromagnetic theory, design and manufacturing technology into a whole, and the existing switched reluctance motor generally needs a direct current power supply as a power supply mode when being driven, so that a three-phase alternating current rectification circuit needs to be converted into direct current in the using process, and meanwhile, some circuit parameters also need to be detected and protected in the motor driving process.

The utility model provides a be not enough to prior art, the utility model provides a multi-functional rectification control circuit has can integrate a plurality of circuits, optimizes advantages such as circuit structure, has solved current switched reluctance motor when the drive, generally needs DC power supply as the power supply mode, consequently need in the use in order becoming the direct current with three-phase alternating current rectifier circuit, simultaneously in the motor drive in-process, still need detect some circuit parameters and the problem of protection.

SUMMERY OF THE UTILITY MODEL

For can integrate a plurality of circuits more than realizing, optimize circuit structure purpose, the utility model discloses a following technical scheme realizes: a multi-functional commutation control circuit, comprising: the multi-channel power supply is connected with the multi-channel power supply and the brake discharge circuit through a 500V direct current voltage circuit respectively, the multi-channel power supply is responsible for providing direct current logic voltage of the whole circuit board, the voltage is connected with the rectification detection circuit and the protection circuit respectively, in addition, the multi-channel power supply also provides a group of isolated 24V direct current power supplies, the end points of the isolated 24V direct current power supplies are represented as B1 and B2, the two end points are connected with the brake discharge circuit and provide independent 24V driving voltage for the discharge IGBT, control signals in the circuit are interconnected between the rectification detection circuit, the brake discharge circuit and the protection circuit, the leakage detection signal end points of the rectification detection circuit are LEAK and 500V direct current detection end points are DCBUS connected with the protection circuit, and meanwhile, the control signals SENSSOR 1-PBE 1 from the brake discharge are connected with the protection circuit through control by 10 control circuits.

Furthermore, the multi-path power supply is a topological structure of single-ended flyback.

Furthermore, the protection circuit monitors four paths of signals which are respectively overcurrent protection, overvoltage protection, leakage protection and overheat protection.

Furthermore, the brake discharge circuit carries out pulse discharge on a 500V voltage external discharge resistor by means of an IGBT.

Further, the rectification detection circuit uses a three-phase rectification module M1 to rectify three phases of 380V into 500V direct current, P14 is an input three-phase 380V connector, the rectified direct current passes through a current sensor S1, the positive terminal of the output direct current 500V is HV, and the negative terminal is HVG.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. the multifunctional rectification control circuit forms a single-ended flyback switching power supply by using a UC2844 chip as a PWM (pulse-width modulation) main control chip and using a field-effect transistor IGB03N120H2 as a switching tube through a multi-path power supply. The power supply outputs generate 24V,5V, -1.3V and an isolated 24V voltage. Sampling adjustment is carried out on the output 24V direct-current voltage, and a TL431 reference chip and an optical coupler MOC8102 are selected as a sampling circuit to jointly complete sampling feedback.

2. This multi-functional rectification control circuit, through four ways of signals of protection circuit control, it is respectively that overcurrent, excessive pressure, electric leakage, overheated. An LM2903 comparator is selected to complete level comparison, when any signal is abnormal, the circuit can close to output the PBE1 signal, and meanwhile, the protecting circuit is output by a bolt lock. The bolt-lock switching circuit consists of 2N7002N channel field effect transistors Q7 and Q11 and FDV304P channel field effect transistors Q8, Q9 and Q10.

3. The multifunctional rectification control circuit is driven by an IGBT (insulated gate bipolar translator) using an HCPL3120 optocoupler, and positive and negative voltages are formed by a 78L18 three-terminal voltage stabilizing chip and are supplied to an operating power supply of the HCPL3120. The input of the optical coupler is controlled by a 2N7002 field effect tube.

4. According to the multifunctional rectification control circuit, a rectification module M1 is used for rectifying three-phase 380V, and two leads of a 500V direct current positive pole and a 500V direct current negative pole penetrate through a current sensor S1 in the same direction to be used as leakage signal detection. The leakage signal S1 is conditioned by the operational amplifier LM258 and then output as LEAK for subsequent circuit determination and measurement. The 500V direct current voltage is subjected to proportional operation by the LM258 operational amplifier to output a DCBUS signal, and the DCBUS can be used for measurement and judgment of a subsequent circuit.

Drawings

FIG. 1 is a schematic diagram of a circuit system according to the present invention;

fig. 2 is a schematic diagram of the brake discharge circuit connector of the present invention;

FIG. 3 is a schematic diagram of brake discharge according to the present invention;

FIG. 4 is a schematic diagram of the multi-path power supply of the present invention;

fig. 5 is a schematic diagram of the three-phase bridge rectification of the rectification detection circuit of the present invention;

fig. 6 is a schematic diagram of the current leakage detection of the rectification detection circuit of the present invention;

fig. 7 is a schematic diagram of bus voltage detection of the rectification detection circuit of the present invention;

fig. 8 is a schematic diagram of the protection circuit of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the 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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

An embodiment of the multi-functional rectifying control circuit is as follows:

referring to fig. 1-8, a multi-functional rectification control circuit includes: the multi-channel power supply is connected with the multi-channel power supply and the brake discharge circuit through a 500V direct current voltage circuit respectively, the multi-channel power supply is responsible for providing direct current logic voltage of the whole circuit board, the voltage is connected with the rectification detection circuit and the protection circuit respectively, in addition, the multi-channel power supply also provides a group of isolated 24V direct current power supplies, the end points of the isolated 24V direct current power supplies are represented as B1 and B2, the two end points are connected with the brake discharge circuit and provide independent 24V driving voltage for the discharge IGBT, control signals in the circuit are interconnected between the rectification detection circuit, the brake discharge circuit and the protection circuit, the leakage detection signal end points of the rectification detection circuit are LEAK and 500V direct current detection end points are DCBUS connected with the protection circuit, and meanwhile, the control signals SENSSOR 1-PBE 1 from the brake discharge are connected with the protection circuit through control by 10 control circuits.

Multi-channel power supply

The multi-path power supply is a topological structure of single-end flyback (figure 2), and has the advantages of simple structure and stable work. It provides working power supply for IC chip and sensor on circuit board, these voltages are 24V,5V, -1.3V, and the ground wire is divided into power ground G and signal ground SG. A U10 chip in the multi-channel power supply is of a UC2844 model, is a switching power supply chip with a built-in PWM generator and works in a PWM current switching mode. The PWM pulse generated by the PWM pulse generator is output by a pin 6 of a U10, enters a resistor R10 and is connected to the grid electrode of a field effect transistor Q2. Q2 is IGB03N120H2 model. The PWM pulse works at the frequency of about 45KHZ for fast switching, and the input 500V direct current is used for providing pulse current for the transformer T1 through the switching tube Q2. The secondary side of the transformer T1 is rectified into direct-current voltage through fast recovery diodes D10, D11 and D12, and then the direct-current voltage is filtered through filtering electrolytic capacitors C15, C18 and C20 to form constant and stable direct-current voltage. The 24V voltage is sampled and fed back in the circuit, U8 is a reference comparator in the circuit, and the model is TL431. The feedback optocoupler U11 is selected to be MOC8102 in model number. The terminals B1-B2 in the figure are independent windings of the transformer, whose purpose is to generate an isolated 24V voltage. The part of the circuit is composed of D9, C9 and C10.

Protective circuit

The protection circuit monitors four signals (fig. 3) which are overcurrent protection, overvoltage protection, leakage protection and overheat protection, respectively. The comparator chips U1, U3, U2 in the figure are of the LM2903 type. In these comparators, when the reverse terminal voltage exceeds the in-phase terminal voltage, the comparator output is inverted to a low level. The outputs of these comparators are connected to the cathodes of diodes D20, D21. The inverted low level pulls down the gate voltage of the transistor Q7 through the diodes D20 and D21, the transistor Q7 enters a cut-off state, the transistor Q9 also enters a cut-off state, and the circuit terminal PBE1 outputs a low level to turn off the driving output. Meanwhile, Q8 enters a saturation state, and the voltage of 5V output by Q8 is connected to the grid electrode of Q9 through a diode D22, so that the circuit latch plays a role in protection.

The terminals SENSOR1 and SENSOR2 of the comparator U1 are derived from the current signal of the current SENSOR, the terminal DCBUS is derived from the 500V DC voltage detection signal, and the terminal LEAK of the comparator U3 is derived from the leakage detection signal.

The endpoints ACR1 and BDR1 come from temperature detection signals and enter a U7 operational amplifier, the model is LM258, the temperature signals are output after passing through the operational amplifier, the endpoint is HEAT, and then the temperature signals enter a comparator U2 to be used as overheating protection.

Brake discharge

When the switched reluctance motor is braked and decelerated, 500V direct-current voltage is increased, so that the safety of devices and braking force are ensured. The brake discharging circuit discharges pulses to a 500V voltage external discharging resistor by an IGBT (figure 4). The circuit terminal HV, HVG are 500V direct current voltage, P12 is the connector of external discharge resistance, and when the IGBT triggers and conducts, the discharge loop is closed, and the discharge resistance discharges to the 500V voltage.

The gate 46 of the IGBT is connected to the 6-7 pins of a U2.32 optocoupler with the model of HCPL3120 through an R53 resistor. The working power supply of the optical coupler is input by end points B1 and B2. U5 is a three-terminal regulator chip, model 78L18. The voltage of 18V is stably output in the circuit, and the voltage of 18V is connected to the 8 pins of the optical coupler to provide positive voltage. The 2 feet of the three-terminal voltage-stabilizing chip are connected with a resistor R52, and the 2 feet of the three-terminal voltage-stabilizing chip are connected with an HVG (high voltage generator), so that a negative voltage can be formed on the R52, and the negative voltage is provided for the 5 feet of the optical coupler. And pins 5 and 8 of the optical coupler are respectively connected with C42 and C43. This is two high frequency low resistance electrolytic capacitors that can be used to decouple the power supply ripple.

Rectification detection circuit

The 2 nd pin of the optocoupler is connected with a resistor R45, a circuit endpoint PBE1 provides an optocoupler input power supply, a circuit endpoint DIS is a discharging trigger signal, when the DIS is in a low-level state, Q3 is cut off, the optocoupler obtains input current, and the IGBT can be triggered to be switched on. DIS high level state, Q3 is saturated, and the opto-coupler has no input current, and IGBT closes.

A three-phase rectification module M1 of the rectification detection circuit rectifies three-phase 380V into 500V direct current, P14 is an input three-phase 380V connector, the three-phase 380V connector is rectified and then passes through a current sensor S1, the positive terminal point of the output direct current 500V is HV, and the negative terminal point is HVG.

The circuit terminal HV is connected with R170, R171 and R172, the terminal HVG is connected with R173, R174 and R175, and the two signals are input to a U5 operational amplifier with the selected model being LM258. The voltage after the equal proportion operation is output by the terminal DCBUS, so that the voltage of the terminal of the DCBUS can be measured by measuring the voltage of the terminal of the DCBUS to measure 500V direct current voltage.

The S1 current sensor is responsible for detecting the leakage current of direct current 500V, and the signal of S1 is connected to R40. R37, R38, R39 and D13 form a voltage bias circuit, and S1 is output to a terminal LEAK after being amplified. The voltage of LEAK fluctuates up and down regardless of the leakage in the forward direction or the reverse direction, so that it is within a voltage range of a normal value of 1.6V.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (3)

1. A multi-functional rectification control circuit, comprising: the multi-channel power supply, the protective circuit, the brake discharge and commutate the detection circuit, the said commutate the detection circuit and connect to multi-channel power supply and brake discharge circuit separately through the 500V direct voltage circuit, the said multi-channel power supply is responsible for providing the direct current logic voltage of the whole circuit board, these voltages connect to commutate detection circuit and protective circuit separately again, in addition, the multi-channel power supply also provides a series of isolated 24V direct current power supplies, its end point is represented as B1, B2, these two end points are connected to the brake discharge circuit, offer the independent 24V driving voltage for discharging IGBT, the control signal in the circuit is interconnected among commutate detection, brake discharge and protective circuit, the electric leakage detection signal end point of the commutate detection circuit is LEAK and 500V direct current detection end point is DCBUS and connected to the protective circuit, the control signal SENSSOR 1-PBE 1 from the brake discharge is connected to the protective circuit through the control altogether 10 circuits;

the multi-path power supply is a single-ended flyback topological structure, the protection circuit monitors four paths of signals together, and the four paths of signals are overcurrent protection, overvoltage protection, leakage protection and overheat protection respectively.

2. The multifunctional rectification control circuit of claim 1, wherein: the brake discharging circuit discharges pulses to a 500V voltage external discharging resistor by means of an IGBT.

3. The multifunctional rectification control circuit of claim 1, wherein: the rectification detection circuit is characterized in that a three-phase rectification module M1 is used for rectifying three-phase 380V into 500V direct current, P14 is an input three-phase 380V connector, the three-phase 380V connector is rectified and then passes through a current sensor S1, the positive terminal point of the output direct current 500V is HV, and the negative terminal point is HVG.

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