WO2009132560A1

WO2009132560A1 - A period time-sharing control circuit

Info

Publication number: WO2009132560A1
Application number: PCT/CN2009/071403
Authority: WO
Inventors: 韩腊生
Original assignee: Han Lasheng
Priority date: 2008-04-29
Filing date: 2009-04-22
Publication date: 2009-11-05

Abstract

A period time-sharing control circuit is mainly consisted of a period time-sharing execution circuit (3), an isolation-coupling/driving circuit (2) and a period time-sharing circuit (1), and whose character is that adopting the switch tube period time-sharing controlling of two independent control circuit to realize power transformation in each power current direction.

Description

Instruction manual

Periodic time division control circuit

Technical field

The invention relates to an AC/DC power conversion circuit, in particular to a conversion circuit suitable for low-power, low-cost, high-reliability high-frequency AC-DC voltage regulating circuits and switching power supply circuits, in particular, a cycle Time-sharing control circuit.

Switching tube is used to realize power conversion. At present, it is realized by single-tube or multi-tube parallel connection, but it is still difficult to solve in practical application, especially in the high-frequency state of large power supply, how to reduce the switch The electrical energy consumption of the tube, the improvement of reliability, and the reduction of manufacturing costs also require further efforts in research and development design techniques.

In the case of an IGBT (Insulated Gate Bipolar Transistor) insulated gate bipolar power switch (hereinafter referred to as IGBT), the device itself is developing very fast, especially in terms of low power consumption, small size, and large current, but Whether the application of IGBT is appropriate is directly related to control technology.

The heat loss during IGBT operation, especially in high-frequency operation, the higher the operating frequency, the more severe the switching loss of the IGBT, resulting in reduced reliability and increased cost.

In the high-power high-frequency power conversion circuit, the temperature rise of the switching loss increases sharply with the increase of the operating frequency of the IGBT. This is due to the existence of thermal resistance between the IGBT core and the heat sink, and the switching loss of the IGBT during high-frequency operation. (heat) It is difficult to synchronize the heat generation with the heat dissipation. If the cost can be achieved, it is unacceptable. Due to the slow heat dissipation, the heat on the IGBT is increased, resulting in an increase in the temperature difference between the IGBT and the heat sink. The reliability of work has dropped significantly. This is a major problem in the development of power conversion products.

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The object of the present invention is mainly to solve the problem that the power conversion circuit has large heat loss in the high-frequency operation state, resulting in poor reliability and high manufacturing cost, and a periodic time-sharing control circuit capable of reducing power consumption is designed.

The technical solution of the present invention is:

A periodic time division control circuit, characterized in that it is mainly composed of a periodic time division execution circuit 3, an isolated coupling/drive circuit 2, and a periodic time division circuit 1.

The cycle time-sharing circuit 3 has two power input and output terminals a and b, and operates under AC power. The a terminal and the b terminal are bidirectional power supply current input and output terminals, and work in a DC power supply or a unidirectional mode. It is a one-way power supply current input and output terminal, which can be used as the output end from the end of the input terminal b, or the output end of the power supply terminal a. The power supply current a in each direction flows to the b terminal or the b terminal to the a terminal. At least two switching transistors or switching circuits that do not work at the same time are time-divisionally completed, and its control input is connected through the isolation coupling/drive circuit 2 The period-timed control circuit of the cycle time-sharing circuit 1 controls the output port corresponding to the output port,

The periodic time division control output port of the periodic time sharing circuit 1 corresponds to the cycle time division execution circuit 3, and each power supply current direction has at least two different duty cycle time division control outputs, which pass through the respective isolation coupling/drive circuit 2 The corresponding control inputs of the circuit 3 are respectively connected to the cycle time division.

The periodic time-sharing execution circuit 3 is composed of at least two switching tubes, wherein their collectors and collectors are connected in parallel, the emitter and the emitter are connected in parallel, and the input and output terminals a and b of the periodic time-sharing execution circuit 3 are The collector and/or the emitter of the switch tube are led out, and the control inputs of the switch tubes are respectively connected to the corresponding control outputs of the cycle time-sharing circuit 1 through respective isolation coupling/drive circuits 2.

The cycle time-sharing execution circuit 3 is composed of a switch tube, and each switch tube has independent control input terminals, which are respectively connected to respective output ends of the respective isolation coupling/drive circuits 2, and the control input ends of the switch tubes are The isolated coupling/driving circuit 2 is connected to and controlled by each corresponding control output port of the periodic time sharing circuit 1. In the same power supply current direction, at least two or more of the switching tubes do not work at the same time.

The switch tube is selected from an IGBT tube or a MOSFET field effect tube, or another switch tube having the same switching function is selected.

The periodic time division execution circuit 3 can be composed of a switch tube Q1, Q2, Q3, Q4 and diodes D1, D2 to form a bidirectional execution circuit, and the isolated coupling/drive circuit 2 can be composed of photocouplers 0D1, OD2, OD3, OD4. , wherein the switch tubes Ql, Q3 are connected in series with the diode D2 to form a terminal flow to the b-end path, the switch tubes Q2, Q4 are connected in parallel with the diode D1 to form a b-end flow to the a-end path, and the emitter of the switch tube Q1 is connected to the switch Q2. The collector of the switch Q2 is connected to the collector of the switch Q4, the emitter of the switch Q4 is connected to the emitter of the switch Q3, the collector of the switch Q3 is connected to the collector of the switch Q1, and the negative of the diode D1 is connected. The collectors of the tubes Q1 and Q3, the anode of the diode D1 is connected to the emitter of the switch tubes Q1, Q2, Q3, Q4 and the anode of the diode D2, and the cathode of the diode D2 is connected to the collector of the switch tubes Q2 and Q4, its input and output The a terminal is composed of the collectors of the switching transistors Q1 and Q3 and the negative electrode of the diode D1, and its input and output b terminals are connected by the collectors of the switching transistors Q2 and Q4 and the negative electrode of the diode D2. Composition, GN1 is the control input of switch Q1, GN2 is the control input of Q2, GN3 is the control input of switch Q3, GN4 is the control input of switch Q4, GN1, GN2, GN3, GN4 pass their respective optocouplers OD3, OD4, 0D1, and OD3 are connected to the periodic time division control output port corresponding to the cycle time division circuit 1.

The periodic time division execution circuit 3 may be composed of a unidirectional execution circuit composed of switch tubes Q1 ', Q2' D1 ', and the isolated coupling/drive circuit 2 is composed of photocouplers 0D1 ', OD2', wherein the switch tube Q1 ', Q2' parallel The diode D1 'protects the anti-parallel to form a-side flow to the b-side unidirectional path, the emitter of the switch Q1' is connected to the emitter of the switch Q2', and the collector of the switch Q1' is connected to the collector of the switch Q2', its The input and output a terminals are composed of the negative pole of the diode D1 ', the collector of the switching transistor Q1 ', and the collector of the switching transistor Q2'. The input and output b terminals are the anode of the diode D1 ' and the emitter of the switching transistor Q1 '. It is composed of the emitter of the switch Q2'. Its GN1 ' is the control input of the switch Q1 ', GN2' is the control input of the switch Q2', and GN1 ', GN2' pass the corresponding optocoupler 0D1. ', OD2' is connected to the periodic time division control output port corresponding to the cycle time division circuit 1.

The periodic time division execution circuit 3 may be composed of a switch tube Q1 ", Q2" diodes D1", D2", D3", D4" to form a bidirectional execution circuit, and the isolated coupling/drive circuit 2 is composed of a photocoupler 0D1", OD2" is constructed, wherein the switching tubes Q1", Q2" are connected in series with the diodes D1", D4" to form a terminal flow to the b-terminal path, the switching transistors Ql", Q2" are connected in parallel with the diodes D3", D2" in series to form the b-end flow direction a The end path, the negative pole of diode D1 ", the collector of switch Q1", the collector of switch Q2" and the negative pole of diode D3", the anode of diode D2", the emitter of switch Q1", the switch Q2 "The emitter is connected to the anode of diode D4". Its input and output a terminals are composed of the anode of diode D1 " and the cathode of diode D2". Its input and output terminals are terminated by diode D3" and diode D4. "The negative pole is connected, its GN1" is the control input of the switch Q1", the GN2" is the control input of the switch Q2", and the GN1 ", GN2" passes the corresponding optocoupler 0D1 ", OD2" and the cycle Time sharing circuit 1 corresponding cycle time-sharing control output port is connected.

The periodic time sharing circuit 1 is mainly composed of a periodic time division control output port circuit, which also has a phase detection input port, a clock input, a control data input port, a freewheeling control output port, a short circuit/overload protection input port, and a Temperature protection input port, short circuit/overload protection control output port.

The isolated coupling/driving circuit 2 is composed of two or more independent input and output isolation coupling paths, and each output terminal thereof is connected to a corresponding control input end of the periodic time division execution circuit 3, and each of its The input end is connected to the output end of the periodic time-division control output port of the periodic time-sharing circuit 1; or consists of a photocoupler and a driving circuit, or may be composed of an opto-coupled driving device, wherein the number of independent paths is The control of the cycle minute execution circuit 3 is determined.

The invention adopts a switch tube of a plurality of independent control loops to realize power conversion by cycle time division control in a parallel connection manner, so that the operating frequency of a single switch tube is doubled, thereby reducing heat loss and heat dissipation cost, and further ensuring The switch tube realizes the reliability of the high frequency power conversion work.

The implementation of the periodic time-sharing control technology method is currently based on an FPGA (Field Programmable Gate Array) S卩 field programmable gate array device. The working principle is:

The cycle time-sharing control divides the high-frequency switching period (PWM) of the power conversion into two or more independent The cycle-timed cycle switch operation is implemented on the switch tube of the control circuit to reduce the operating frequency of the single switch tube, thereby reducing the heat loss of the switch tube in the power conversion circuit.

Figure 2 is a description of the working principle of the periodic time-sharing control in each sine wave power supply assumed by the periodic time-sharing control technology in the sine wave power supply voltage regulation application. The periodic time-sharing control output of the periodic time-sharing circuit (1) is independent. The four output terminals L_A1, L_A2, N_A1, and N_A2 form a bidirectional voltage regulation control, in which L_A1 and L_A2 complete L-direction voltage regulation (L group), and N_A1 and N_A2 complete N-direction voltage regulation (N group), a in FIG. The figure is the waveform of the sine wave power supply voltage regulation, wherein the filled part is the current turn-on period in the PWM high-frequency switching period, and the b picture in FIG. 2 is the L-group and N-group periodic time-division control output ports L_A1, L_A2, N_A1. N_A2 output timing of each output control terminal, where L_A1, L_A2 and B N_A1, N_A2 are respectively controlled by photoelectric isolation/driving to control four voltage regulating switch tubes Ql, Q3 and Q2, Q4, which can be seen from the diagram b in Fig. 2. The sinusoidal voltage regulation is completed by 18 PWM control cycles in the positive and negative half cycles of a sine wave power supply cycle. The PWM switching period allocated by Q1 during the L period is: 1, 3, 5, 7, 9, 11, 13, 15, 17 (called: odd weeks) The PWM switching period allocated by Q3 is: 2, 4, 6, 8, 10, 12, 14, 16, 18 (called: even weeks); Similarly, the PWM switching period allocated in the negative half cycle Q2 is : 1, 3, 5, 7, 9, 11, 13, 15, 17, Q4 The PWM switching period assigned is: 2, 4, 6, 8, 10, 12, 14, 16, 18, apparently in each direction The PWM switching period in the power regulating current loop is divided into two independent control loop regulating switch tubes, and the operating frequency of the single voltage regulating switch tube is reduced by half. If more power is connected in parallel in each direction of the power regulating circuit The voltage regulating switch tube of the independent control circuit, wherein the operating frequency of the single voltage regulating switch tube will be reduced by a multiple with the increase of the number of applications of the voltage regulating switch tube.

The lower the operating frequency of the voltage regulating switch, the lower its turn-on and turn-off losses, and the lower the operating temperature. In practice, we found that when the (IGBT) voltage regulating switch tube is operated at high frequency, the operating frequency rises. If there is no very good heat sink, the temperature will rise sharply. This temperature rise is far compared to the cycle time-sharing control. Farther than the total loss of time-sharing control, so the cycle time-sharing control technology can effectively reduce the heat-dissipation cost, power loss, improve the reliability of the voltage-regulating switch tube, and at the same time increase the operating frequency of the power circuit. Further improve the effectiveness of the work.

The one-way power switch circuit can be realized by the cycle time-sharing execution circuit 3 of the present invention, and the two-way power switch circuit can also be realized. It is characterized in that at least two or more independent control loop switching tubes are formed in each power supply current direction to realize periodic time division control, and only two switching tubes are used in the same power supply current direction. The two switching tubes must be operated at different times. Three switching tubes are used in the same power supply current direction. Two of the switching tubes work simultaneously with the other switching tube. In this case, the periodic time division control is established. As the technology advances, the cycle time-sharing execution circuit 3 can be modularized to make it smaller.

The beneficial effects of the invention:

1. The operating heat loss of the switching tube decreases when the power is changed, and the operational reliability of the circuit is further improved; 2. The operating frequency of the single switching tube is reduced by a factor of two, and the operating frequency in the power conversion circuit can be designed to be higher, thereby improving the working efficiency;

3. The manufacturing cost of the heat sink is greatly reduced, and the volume of the device is reduced;

4. Due to the reduced operating frequency of the single control input loop, the selection of the electronic components in the product manufacturing process is expanded, which has great advantages in reducing the manufacturing cost of the product, so that many low-frequency and low-cost electronic components are obtained. Full application

5. The periodic time-sharing control method is superior to the simple switching tube parallel mode. The simple parallel voltage-regulating switch tube still works at high frequency. It is difficult to achieve current sharing in parallel application. The positive temperature characteristics of the switch tube alone are The flow is limited. The parallel application circuit design and structural layout requirements are high, and the switching tubes must be paired. In particular, the wiring requirements of the control part are strictly equal. The current that the IGBT can withstand is already very large, and the key is in the high frequency. The lower tube temperature is rapidly accumulated, so the present invention can well solve the high-frequency circuit operation and make the switch tube work reliably under a large current.

6. The design of the dedicated cycle time-sharing circuit is successful, the control circuit is highly integrated, the application reliability is improved, the volume is small, the application design is very flexible and convenient, the energy consumption and cost are significantly reduced, the circuit protection response is fast, and in the past, multi-channel is realized. Independent control is a very difficult thing, and it has high cost, large occupied area, and slow response and reliability of information processing during work. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing the electrical structure of the present invention.

2 is a timing diagram of the cycle time-sharing control output of the present invention

Figure 3 is one of the example electrical schematics of the present invention.

Figure 4 is a second schematic diagram of an electrical schematic of the present invention.

Figure 5 is a third electrical schematic diagram of the present invention.

The invention will now be further described with reference to the accompanying drawings and embodiments.

A plurality of implementations of a periodic time division control circuit, which is mainly composed of a periodic time division execution circuit 3, an isolated coupling/drive circuit 2, and a periodic time division circuit 1, wherein the periodic time division circuit 1 is an integrated chip (optional Lattice's FPGA CPLD device or other company's FPGA CPLD, such as the LFXP3C programming of the lattice company), each relevant input signal is connected with the corresponding input terminal of the periodic time-sharing circuit 1. The operation of the circuit requires phase at the AC power supply. Signal detection input, so that the power supply voltage regulation output waveform is synchronized with the input power supply waveform, the clock input is a counter signal source for voltage regulation and period time division control, and the control data input is for controlling the amplitude of the voltage regulation output, at a fixed voltage regulation output. In the case of the output feedback, the control data can be generated inside the chip. In order to make the circuit work reliably, short circuit, overload and over temperature protection are usually required.

Embodiment 1.

As shown in Figure 3.

The cycle time-sharing control output of the cycle time-sharing circuit 1 has four independent outputs L_A1, L_A2, N_A1, and N_A2, which are executed by respective isolation coupling/drive circuits 2, that is, OD1, OD2, OD3, and OD4. The control input terminal of the circuit 3, the cycle time-sharing execution circuit 3 has two power supply current input and output terminals a and b, the specific electrical schematic is shown in Figure 3, Figure 3 is a cycle of the present invention for AC power control The time-sharing circuit, wherein the period-timed execution circuit 3 is mainly composed of a switch tube Q1, Q2, Q3, Q4 and diodes D1, D2 to form a bidirectional execution circuit, and the isolated coupling/drive circuit 2 is composed of photocouplers OD1, OD2 OD3, OD4 are composed, wherein Ql and Q3 are connected in parallel with D2 to form a-side flow to b-end path, Q2, Q4 are connected in parallel with D1 to form b-end flow to a-end path, Q1's emitter is connected to Q2's emitter, Q2's collector Connected to the collector of Q4, the emitter of Q4 is connected to the emitter of Q3, the collector of Q3 is connected to the collector of Q1, the cathode of D1 is connected to the collector of Q1 and Q3, and the anode of D1 is connected to Ql, Q2, Q3, Q4 Emitter and D2 The positive electrode, the negative electrode of D2 is connected to the collectors of Q2 and Q4, and its input and output a terminals are composed of the collectors of Q1 and Q3 and the negative electrode of D1, and its input and output b terminals are connected by the collectors of Q2 and Q4 and D2. The negative pole is connected, GN1 is the control input of Q1, GN2 is the control input of Q2, GN3 is the control input of Q3, GN4 is the control input of Q4, GN1, GN2, GN3, GN4 pass the corresponding optocouplers OD3, OD4 0D1 and OD2 are connected to the control output port corresponding to the cycle time division circuit 1. Its working principle is: Under the control of the cycle time division circuit 1 cycle time division, the number of high frequency voltage regulation PWM chopping cycles in each cycle of the sine wave power supply is equally divided into the switches in the cycle time division execution circuit 3. On-pipe cycle time-sharing work.

The specific work process is as follows:

See cycle time-sharing timing diagram 2

When the sine wave supply current flows from L to N half cycle, its working principle is (called positive half cycle) (see Figure 2), at the first, third, fifth, seventh, ninth, eleventh, thirteenth, nineteenth, and seventeenth... PWM斩During the wave period, the power supply current is from the terminal a of the cycle time-sharing execution circuit through Q1, D2 to the b-end of the cycle time-sharing execution circuit, and the odd-cycle PWM chopping cycle voltage regulation operation process is completed, in which Q3 is closed, Q2 is closed. Q4 does not work;

During the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th... PWM chopping cycle, the supply current flows from the a-end of the cycle-timed execution circuit via Q3, D2 to the cycle-timed execution circuit b End, complete the even-cycle PWM chopping cycle voltage regulation work process, in this process, Q1 is closed, Q2, Q4 are not working;

When the sine wave supply current flows from N to L half cycle, its working principle is (called negative half cycle) (see Figure 2), at the first, third, fifth, seventh, ninth, eleventh, thirteenth, nineteenth, and seventeenth... During the wave period, the power supply current is executed from the cycle time-sharing circuit The b-end is executed by Q2, Dl to the end of the cycle time-sharing circuit, and the odd-cycle PWM chopping cycle voltage regulation process is completed. In this process, Q4 is turned off, and Ql and Q3 are not working;

During the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th ... PWM chopping cycle, the power supply current flows from the b terminal of the cycle time-sharing execution circuit through Q4, Dl to the cycle time-sharing execution circuit a terminal, complete the even-cycle PWM chopping cycle voltage regulation work process, in this process Q2 is closed, Ql, Q3 are not working;

In the above working process, the switching tubes (Ql, Q3, Q2, Q4) with positive and negative half-cycle current direction are cycled under the periodic time-sharing control of the periodic time-sharing circuit (1).

Embodiment 2 (shown in Figure 5).

5 is an electrical schematic diagram of another cycle time sharing circuit of the present invention, wherein the cycle time division execution circuit 3 is mainly composed of a switch tube Q1 ', Q2' Dl ', and a unidirectional execution circuit, the isolated coupling/drive circuit (2) It consists of optocouplers 0D1 ', OD2', in which Ql ', Q2' are connected in parallel with Dl 'protection anti-parallel to form a-side flow to b-side unidirectional path, Q1' emitter is connected to Q2' emitter, Q1 ' The collector is connected to the collector of Q2', and its input a terminal is composed of the negative terminal of D1 ', the collector of Q1 ' and the collector of Q2, and its output b terminal is emitted by the positive electrode of D1 ', Q1 ' The pole is connected with the emitter of Q2', its GN1 ' is the control input of Q1 ', GN2' is the control input of Q2', and GN1 ', GN2' pass their respective optocouplers OD1 ', OD2' and The cycle control circuit 1 corresponds to the cycle limit control time when the output port is connected.

Its working principle is: Under the periodic time-sharing control of the cycle time-sharing circuit 1, the one-way power supply high-frequency voltage-regulating PWM chopping cycle number is equally divided into the cycle time-sharing operation on the switching pipe in the cycle time-sharing execution circuit 3. .

The specific work process is as follows (see Figure 2):

During the 1st, 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th... PWM chopping cycle, the supply current flows from the a terminal of the cycle time-sharing execution circuit via Q1 ' to the b-side of the cycle time-sharing circuit , complete the odd-cycle PWM chopping cycle voltage regulation work process, in which Q2' is turned off;

During the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th ... PWM chopping cycle, the supply current flows from the a terminal of the cycle time-sharing execution circuit to the b-side of the cycle time-sharing circuit through Q2' , complete the even-cycle PWM chopping cycle voltage regulation work process, in this process Q1 'close;

The two switching tubes Ql ', Q2' are ordered alternately cyclically operated under the action of periodic time division control.

Embodiment 3 (shown in Figure 4).

Figure 4 is another AC sine wave power supply cycle time-sharing voltage regulating circuit. The cycle time-sharing control output of the periodic time-sharing circuit 1 has two independent outputs L/N_A1 and L/N_A2, and the two outputs have double Layer function, realize AC sine wave power supply L half cycle and N half cycle time division voltage regulation work, they are connected to the control input terminal of cycle time division execution circuit 3 through respective isolation coupling/drive circuit 2, namely 0D1, OD2, cycle time division execution circuit 3 has two power supply current input and output

- 1 - The output a and b ends, the specific electrical schematic is shown in Figure 4.

The periodic time division execution circuit 3 is mainly composed of a switch tube Q1 ", Q2", diodes D1", D2", D3", D4" to form a bidirectional execution circuit, and the isolated coupling/drive circuit 2 is composed of a photocoupler 0D1 ", OD2" is composed, in which Ql ", Q2" is connected in parallel with Dl ", D4" to form a-side flow to the b-end path, Ql ", Q2" is connected in parallel with D3", D2" to form a b-end flow to the a-end path, D1 "The negative electrode, the collector of Q1", the collector of Q2" and the negative electrode of D3" are connected, the anode of D2", the emitter of Q1", the emitter of Q2" and the anode of D4" are connected, its input The output a terminal is composed of the positive pole of D1 " and the negative pole of D2". Its input and output b terminals are composed of the negative pole of D3" and the negative pole of D4". Its GN1 "is the control input of Q1", GN2 The control input of "is Q2", GN1 ", GN2" is connected to the control output port corresponding to the periodic time division circuit 1 through the respective photocouplers OD1", OD2".

Its working principle is: under the control of the cycle time division circuit 1 cycle time division, the high frequency voltage regulation PWM chopping cycle in the positive and negative half cycle of the sine wave power supply is output through L/N_A1 and L/N_A2. The cycle time division operation on the switch tube in the circuit 3 is performed in the cycle time division.

The specific work process is as follows:

See cycle time-sharing timing diagram 2

When the sine wave supply current flows from L to N half cycle, its working principle is (called positive half cycle) (see Figure 2), at the first, third, fifth, seventh, ninth, eleventh, thirteenth, nineteenth, and seventeenth... PWM斩During the wave period, the power supply current from the end of the cycle time-sharing execution circuit through D1 ", Q1", D4" to the b-end of the cycle time-sharing circuit, completes the odd-cycle PWM chopping cycle voltage regulation process, in the process Q2" is closed;

During the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th... PWM chopping cycle, the supply current flows from the end of the cycle time-sharing circuit via Dl ", Q2", D4" to the cycle When the b-end of the circuit is executed, the even-period PWM chopping cycle voltage regulation process is completed, in which Q1 is "closed;

When the sine wave supply current flows from N to L half cycle, its working principle is (called negative half cycle) (see Figure 2), at the first, third, fifth, seventh, ninth, eleventh, thirteenth, nineteenth, and seventeenth... During the wave period, the power supply current from the b-end of the cycle time-sharing execution circuit through D3", Q1", D2" to the a-end of the cycle time-sharing execution circuit, completes the odd-cycle PWM chopping cycle voltage regulation work process, in the process Q2" is closed;

During the 2nd, 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th... PWM chopping cycle, the supply current flows from the b-end of the cycle-timed execution circuit via D3", Q2", D2" to the cycle When the a terminal of the circuit is executed, the even-period PWM chopping cycle voltage regulation operation process is completed, in which Q1 is "closed;

In the above working process, the switching tubes (Ql ", Q2") of the positive and negative half-cycle current direction are cycled under the periodic time-sharing control of the periodic time-sharing circuit (1). The periodic time-sharing circuit (1) involved in the first embodiment, the second embodiment and the third embodiment is completed by the LFXP3C of a programmable integrated circuit control chip, and can also be implemented by an auxiliary circuit by using a programmable device of another company. It can also be implemented by making an application specific integrated circuit of a non-FPGA device by referring to the periodic time sharing circuit (1) in FIG.

Field Programmable Gate Array (FPGA) is a field programmable gate array device. It is in PAL, GAL,

A further development of products based on programmable devices such as EPLD. It emerged as a semi-custom circuit in the field of application-specific integrated circuits (ASICs), which not only solves the shortcomings of custom circuits, but also overcomes the shortcomings of the limited number of original programmable device gates. The use of FPGAs is very flexible, as long as programming different data through hardware language descriptions, it is convenient to implement different digital functions in the same circuit chip.

The parts not covered by the present invention are the same as the prior art or can be implemented by the prior art.

Claims

The invention provides a periodic time division control circuit, which is characterized in that it is mainly composed of a periodic time division execution circuit (3), an isolated coupling/drive circuit (2), and a periodic time division circuit (1);

The cycle time-sharing execution circuit (3) has two power input and output terminals a and b, and operates under AC power, and the a terminal and the b terminal are bidirectional power supply current input and output terminals, in a DC power supply or a unidirectional manner. The next work is a one-way power supply current input and output terminal, which can be from the a terminal to the input terminal b as the output terminal, or the b terminal can be the power input terminal a terminal as the output terminal, and the power supply current a in each direction flows to the b terminal or The b-end flows to the a-end, wherein at least two switches or switching circuits that do not work at the same time are completed in a time-division manner, and the control input thereof is connected to the cycle of the periodic time-sharing circuit (1) through the isolated coupling/drive circuit (2). Control the output corresponding to the output port;

The periodic time-sharing control output port of the periodic time-sharing circuit (1) corresponds to a periodic time-division execution circuit (3), and each power supply current direction has at least two different time-time control outputs, which are coupled through respective isolations. / The drive circuit (2) is connected to the corresponding control input of the cycle time-sharing execution circuit (3).

The periodic time division control circuit according to claim 1, wherein said periodic time division executing circuit (3) is composed of at least two switching tubes, wherein their collectors and collectors are connected in parallel, and the emitters are The emitter is connected in parallel, and the input and output terminals a and b of the periodic time-sharing execution circuit (3) are taken out from the collector and/or the emitter of the switch tube, and the control input terminals of each switch tube pass through respective isolation coupling/drive circuits (2) ) Connect the corresponding control outputs of the periodic time-sharing circuit (1).

The periodic time division control circuit according to claim 1, wherein said periodic time division execution circuit (3) is composed of a switch tube, and each switch tube has independent control input terminals, which are respectively connected to respective isolation couplings. /Drive circuit

(2) corresponding output terminals, the control input terminals of each switch tube are connected to and controlled by the corresponding control output ports of the periodic time-sharing circuit (1) via the isolated coupling/drive circuit (2), at the same supply current At least two or more channels of the switch tubes in the direction do not work at the same time.

The periodic time division control circuit according to claim 1, wherein the switching tube is an IGBT tube or a MOSFET field effect tube, or another switching tube having the same switching function is selected.

The periodic time division control circuit according to claim 1, wherein said periodic time division executing circuit (3) is composed of switching transistors Q1, Q2, Q3, Q4 and diodes D1, D2 to form a bidirectional execution circuit, The isolated coupling/driving circuit (2) can be composed of optocouplers 0D1, OD2, OD3, OD4, wherein the switching transistors Ql, Q3 are connected in parallel with the diode D2 to form a terminal flow to the b terminal path, and the switching transistors Q2, Q4 are connected in parallel with the diode D1. The b-side of the series is connected to the a-side path, the emitter of the switch Q1 is connected to the emitter of the switch Q2, the collector of the switch Q2 is connected to the collector of the switch Q4, and the emitter of the switch Q4 is connected to the emitter of the switch Q3. The collector of the switching transistor Q3 is connected to the collector of the switching transistor Q1, and the cathode of the diode D1 is connected to the collector of the switching transistors Q1 and Q3, the second pole The anode of the tube D1 is connected to the emitter of the switch tubes Q1, Q2, Q3, Q4 and the anode of the diode D2, and the cathode of the diode D2 is connected to the collector of the switch tubes Q2 and Q4, and its input and output a terminals are controlled by the switch tubes Ql, Q3. The collector is connected with the cathode of the diode D1, and its input and output b terminals are composed of the collectors of the switching tubes Q2 and Q4 and the cathode of the diode D2. GN1 is the control input of the switching transistor Q1, and GN2 is the control of the Q2. Input, GN3 is the control input of switch Q3, GN4 is the control input of switch Q4, GN1, GN2, GN3, GN4 correspond to cycle time-sharing circuit (1) through their corresponding photocouplers OD3, OD4, 0D1, OD3 The cycle time-sharing control output ports are connected.

The periodic time division control circuit according to claim 1, wherein said periodic time division execution circuit (3) is composed of a switch unidirectional execution circuit composed of switch tubes Q1', Q2' D1', said isolated coupling The driving circuit (2) is composed of photocouplers OD1' and OD2', wherein the switching tubes Ql', Q2' are connected in parallel with the diode D1' to protect the anti-parallel to form a-side flow to the b-terminal unidirectional path, and the emitter of the switching transistor Q1' Connect the switch tube Q2' emitter, the collector of switch tube Q1' is connected to the collector of switch tube Q2', its input and output a terminal is the cathode of diode D1', the collector of switch tube Q1' and the switch tube Q2' The collector is connected, and its input and output b ends are composed of the anode of the diode D1', the emitter of the switch Q1' and the emitter of the switch Q2', and its GN1' is the control input of the switch Q1'. GN2' is the control input of the switch tube Q2', and GN1' and GN2' are connected to the cycle time-sharing control output port corresponding to the cycle time-sharing circuit (1) through the corresponding photocouplers OD1' and OD2'.

The periodic time division control circuit according to claim 1, wherein said periodic time division execution circuit (3) is bidirectionally formed by switching transistors Q1", Q2" diodes D1", D2", D3", D4" Execution circuit, the isolated coupling/driving circuit (2) is composed of photocouplers OD1", OD2", wherein the switching tubes Ql", Q2" are connected in parallel with the diodes D1", D4" in series to form an end flow to the b-end path, The switching transistors Ql" and Q2" are connected in parallel with the diodes D3" and D2" to form a b-side flow to the a-side path, the negative terminal of the diode D1", the collector of the switching transistor Q1", the collector of the switching transistor Q2" and the diode D3" The negative pole is connected, the anode of the diode D2", the emitter of the switch Q1", the emitter of the switch Q2" and the anode of the diode D4" are connected, and its input and output a terminals are connected by the anode of the diode D1" and the diode D2" The negative pole is connected, and its input and output b ends are composed of the anode of diode D3" and the cathode of diode D4". Its GN1" is the control input of the switch Q1", and the control of GN2" is the control of the switch Q2". Input, GN1", GN2" The respective corresponding photocouplers OD1", OD2" are connected to the periodic time division control output port corresponding to the periodic time sharing circuit (1).

The periodic time division control circuit according to claim 1, wherein said periodic time sharing circuit (1) is mainly composed of a periodic time division control output port circuit, wherein there is also a phase detection input port, a clock input, Control data input port, freewheeling control output port, short circuit/overload protection input port, over temperature protection input port, short circuit/overload protection control output port. The periodic time division control circuit according to claim 1, wherein said isolated coupling/driving circuit (2) is composed of two or more independent input and output isolation coupling paths, each of which The output end is connected to the corresponding control input end of the periodic time division execution circuit (3), and each input end thereof is connected to the output end corresponding to the periodic time division control output port of the periodic time sharing circuit (1); or by the optocoupler and The driving circuit is composed of an optocoupler and a driving device, and the number of independent paths is determined by the control requirements of the periodic sub-execution circuit (3).