阅读说明：本技术 功率半导体开关器件驱动电源电路装置及其启动方法 (power semiconductor switching device driving power supply circuit device and starting method thereof ) 是由 郑立楷 于 2019-08-28 设计创作，主要内容包括：本发明实施例公开了一种功率半导体开关器件驱动电源电路装置及其启动方法,所述电源电路装置包括PWM产生及控制电路、DC电源、驱动电路、供电控制电路、斩波电路及整流电路,DC电源与供电控制电路电连接,PWM产生及控制电路与斩波电路电连接,斩波电路与整流电路对应设置,驱动电路与整流电路电连接,供电控制电路与斩波电路、PWM产生及控制电路电连接,供电控制电路通过控制给斩波电路和斩波控制的PWM产生及控制电路的供电时间差来实现电源电路的软起。本发明逻辑简单,易于实现；此外,摆脱了必须使用专用高成本电源管理芯片的情况,一方面可以大大降低成本,减少供货问题造成的损失,有显著的经济效益,同时让电路的设计变的更加灵活。(The embodiment of the invention discloses a power semiconductor switching device driving power supply circuit device and a starting method thereof, wherein the power supply circuit device comprises a PWM (pulse-width modulation) generating and controlling circuit, a DC (direct current) power supply, a driving circuit, a power supply controlling circuit, a chopper circuit and a rectifying circuit, the DC power supply is electrically connected with the power supply controlling circuit, the PWM generating and controlling circuit is electrically connected with the chopper circuit, the chopper circuit is arranged corresponding to the rectifying circuit, the driving circuit is electrically connected with the rectifying circuit, the power supply controlling circuit is electrically connected with the chopper circuit and the PWM generating and controlling circuit, and the power supply controlling circuit realizes the soft start of the power supply circuit by controlling the power supply time difference of the PWM generating and controlling circuit for the chopper circuit and the. The invention has simple logic and easy realization; in addition, the situation that a special high-cost power supply management chip is needed to be used is eliminated, on one hand, the cost can be greatly reduced, the loss caused by the supply problem is reduced, the economic benefit is remarkable, and meanwhile, the design of the circuit is more flexible.)

1. The utility model provides a power semiconductor switching device drive power supply circuit device, including PWM produces and control circuit, DC power and drive circuit, its characterized in that, still include power supply control circuit, chopper circuit and rectifier circuit, the DC power is connected with power supply control circuit electricity, PWM produces and control circuit and chopper circuit electricity is connected, chopper circuit and rectifier circuit correspond the setting, drive circuit is connected with rectifier circuit electricity, power supply control circuit and chopper circuit, PWM produces and control circuit electricity is connected, still stride between power supply control circuit and the chopper circuit and be equipped with filter capacitor, power supply control circuit realizes power supply circuit's soft-start through the power supply time difference of controlling the PWM that controls for chopper circuit and chopper and control circuit.

2. A method of starting a power semiconductor switching device driving power supply circuit apparatus, comprising:

Step 1: the power supply control circuit supplies power to the PWM generating and controlling circuit;

Step 2: after the power supply voltage of the PWM generating and controlling circuit rises to the working voltage of the PWM generating and controlling circuit, the PWM generating and controlling circuit outputs a PWM signal to drive the chopper circuit to normally switch;

and step 3: and then the power supply control circuit provides power supply for the chopper circuit.

Technical Field

the invention relates to the technical field of power supplies, in particular to a power semiconductor switching device driving power supply circuit device and a starting method thereof.

Background

semiconductor switching devices, such as IGBTs, MOSFETs, etc., are required to be used in power conversion devices such as electric vehicle controllers. Particularly for a high-power conversion device, the switch driving of the power semiconductor device needs a special driving power circuit to provide power for the driving circuit driving the switch of the semiconductor device. The driving power source is usually a low-voltage direct-current power source of the control part, and for an electric automobile controller, the driving power source is a 12V/24V low-voltage battery of the whole automobile. Usually, in order to ensure safety and realize isolation of high and low voltage sides, isolated DC/DC power supplies are adopted. The topologies commonly used as the IGBT driving power supply circuit at present mainly comprise two types, one type is a flyback topology power supply topology, and the other type is a single-end flyback circuit; one is a forward power supply topology, which includes a forward circuit, a half-bridge/full-bridge circuit, a push-pull circuit, etc.

The current driving power supply circuit mainly has the following problems:

1. flyback power supply topology:

(1) The starting of the power supply and the control of the output voltage must be realized through closed-loop control by a special flyback power supply chip or a complex feedback control circuit. Particularly, for occasions requiring certain isolation safety requirements, an isolation link (as shown in figure 1) needs to be added into a feedback circuit, so that the cost is obviously increased;

(2) In a chopper circuit of a flyback topology, when the inductor current is turned off to force commutation, electromagnetic interference such as leakage inductance peak and the like can be generated, and the EMC effect of the system is seriously influenced.

2. Forward class topology:

(1) The control of the output voltage can be realized by controlling the turn ratio of the transformer and the input voltage without closed-loop control, and the cost of an isolation feedback control loop can be reduced. For the driving circuit, a larger charge needs to be provided at the moment of switching the power device to ensure the effective and reliable control of the driving circuit. It is usually necessary to add a large filter capacitor at the output side of the driving power supply to ensure the requirement of instantaneous charge (see fig. 1 and 2). Therefore, when the forward driving power supply circuit is started, the capacitor at the output end is equivalent to an instantaneous short circuit, so that a large starting current can be generated during starting. On one hand, the stress of a device in a power supply circuit exceeds standard and is even damaged, and the service life is shortened; on the other hand, the sudden large current can affect the operation of other circuits in the system, so that the system generates unnecessary faults.

(2) in order to solve the problem in (1), it is generally necessary to use a power management chip with a soft-start function, so that soft-start of the circuit is realized at the time of start-up, and the start-up current is reduced. Generally, chips with soft functions for a specific forward topology have fewer available types, higher cost and often have supply risks.

3. The principle of the method for realizing the soft start of the circuit by the special power supply chip is that the width of the output PWM is controlled at the beginning of power-on, that is, the PWM signal with extremely small duty ratio is output at the beginning, and then the PWM signal is gradually increased to the PWM signal which normally works (as shown in fig. 3). The circuit principle of the mode is complex, the mode is difficult to realize by a simple logic circuit, and particularly, a special integrated circuit is required to be used for realizing a half-bridge/full-bridge circuit which needs to output two paths of complementary PWM.

Disclosure of Invention

The technical problem to be solved by the embodiments of the present invention is to provide a power semiconductor switching device driving power circuit apparatus and a starting method thereof, so as to achieve soft start of the power circuit.

In order to solve the above technical problems, an embodiment of the present invention provides a power semiconductor switching device driving power supply circuit device, which includes a PWM generating and controlling circuit, a DC power supply and driving circuit, a power supply controlling circuit, a chopper circuit and a rectifying circuit, wherein the DC power supply is electrically connected to the power supply controlling circuit, the PWM generating and controlling circuit is electrically connected to the chopper circuit, the chopper circuit is disposed corresponding to the rectifying circuit, the driving circuit is electrically connected to the rectifying circuit, the power supply controlling circuit is electrically connected to the chopper circuit and the PWM generating and controlling circuit, and the power supply controlling circuit implements soft start of the power supply circuit by controlling a power supply time difference between the PWM generating and controlling circuit for the chopper circuit and chopper control.

Correspondingly, the embodiment of the invention also provides a starting method of the power semiconductor switching device driving power supply circuit device, which comprises the following steps:

Step 1: the power supply control circuit supplies power to the PWM generating and controlling circuit;

Step 2: after the power supply voltage of the PWM generating and controlling circuit rises to the working voltage of the PWM generating and controlling circuit, the PWM generating and controlling circuit outputs a PWM signal to drive the chopper circuit to normally switch;

And step 3: and then the power supply control circuit provides power supply for the chopper circuit.

the embodiment of the invention has the beneficial effects that: the structure is simple, the power supply control circuit can be realized by simple circuits such as a resistor, a capacitor, a triode and the like, and compared with a circuit for controlling the pulse width of a PWM signal, the logic is simple and easy to realize; since the soft start is not dependent on PWM generation in the control circuit, the PWM generation circuit can be realized by a simple RC oscillating circuit or a PWM generator with simple function, thereby getting rid of the condition that a special high-cost power management chip is necessary to be used. On one hand, the cost can be greatly reduced, the loss caused by the supply problem is reduced, the economic benefit is remarkable, and the design of the circuit is more flexible.

drawings

Fig. 1 is a circuit block diagram of a flyback drive power supply of the related art.

fig. 2 is a circuit block diagram of a forward type driving power supply of the prior art.

fig. 3 is a schematic diagram of a half-bridge full-bridge type power chip soft start PWM signal in the prior art.

Fig. 4 is a circuit block diagram of a power semiconductor switching device driving power supply circuit device of an embodiment of the present invention.

Fig. 5 is a timing chart of a circuit start-up process of the power semiconductor switching device driving power supply circuit apparatus of the embodiment of the present invention.

Fig. 6 is a flowchart of a starting method of the power semiconductor switching device driving power supply circuit apparatus according to the embodiment of the present invention.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other without conflict, and the present invention is further described in detail with reference to the drawings and specific embodiments.

if directional indications (such as up, down, left, right, front, and rear … …) are provided in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the movement, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only used for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

Referring to fig. 4 to 5, a power semiconductor switching device driving power circuit device according to an embodiment of the present invention includes a PWM generating and controlling circuit, a DC power supply, a driving circuit, a power supply controlling circuit, a chopper circuit, and a rectifying circuit.

The DC power supply is electrically connected with the power supply control circuit, the PWM generating and controlling circuit is electrically connected with the chopper circuit, the chopper circuit is arranged corresponding to the rectifying circuit, and the driving circuit is electrically connected with the rectifying circuit. The power supply control circuit is electrically connected with the chopper circuit and the PWM generating and controlling circuit, a filter capacitor is further arranged between the power supply control circuit and the chopper circuit in a crossing mode, and the power supply control circuit controls the power supply time difference of the chopper circuit and the PWM generating and controlling circuit controlled by chopping to achieve soft start of the power supply circuit.

the soft start of the power supply circuit is realized by controlling the power supply of the PWM generation and control circuit and the logic of the chopper circuit, and the specific scheme is detailed as follows:

As shown in fig. 4, the present invention implements soft-start of the power supply circuit by controlling the power supply time difference to the chopper circuit and the PWM generation and control circuit for chopper control. At the beginning of power-on, the PWM generating and controlling circuit is firstly powered on through control and works to generate a PWM signal, and the pulse width of the PWM signal does not need to be controlled. After the PWM generating and controlling circuit works normally to output PWM signals to drive a power switch device of the chopper circuit to generate a switch, power is provided for the chopper circuit. Due to the presence of the power supply input capacitance (filter capacitance) (see fig. 4), the power supply of the chopper circuit will gradually rise from 0V to the DC power supply value. Since the PWM signal is established before, i.e. at the beginning of 0V, it is possible to transfer energy to the other side of the transformer via the chopper circuit to charge the output capacitor. Since the voltage of the chopper circuit in the initial operation is small, a current surge is not generated substantially. And along with the rising of the chopper circuit power supply, the output power supply also rises synchronously, thereby avoiding the current impact in the starting process.

As shown in fig. 5, which is a timing diagram of the circuit start-up process of the present invention, at time t0, the DC power supply starts to be powered on, first, the power supply of the PWM generation and control circuit rises, and after the power supply rises to the operating voltage of the PWM generation and control circuit, the PWM signal starts to be output at time t 1; at time t2, the power supply voltage of the chopper circuit starts to gradually increase from 0, and since the switching tube of the chopper circuit is operated by the existing PWM signal, the output voltage starts to increase from 0 with the input voltage. Since the output voltage gradually rises from zero, there is no current overshoot.

Referring to fig. 6, the method for starting the power semiconductor switching device driving power circuit apparatus of the present invention includes:

step 1: the power supply control circuit supplies power to the PWM generating and controlling circuit;

Step 2: after the power supply voltage of the PWM generating and controlling circuit rises to the working voltage of the PWM generating and controlling circuit, the PWM generating and controlling circuit outputs a PWM signal to drive the chopper circuit to normally switch;

and step 3: and then the power supply control circuit provides power supply for the chopper circuit.

The power supply voltage of the chopper circuit starts to gradually rise from 0, and the output voltage starts to rise from 0 along with the input voltage because the switching tube of the chopper circuit is operated by the existing PWM signal; since the output voltage gradually rises from zero, there is no current overshoot.

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.