JP2011193550A - Pulse power supply unit and pulse voltage generation method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accelerate the rise time of an output voltage Vout and make a start-up time constant even under input fluctuation when a pulse voltage is generated. <P>SOLUTION: A pulse power supply unit includes a switching power supply circuit 12 that is driven in synchronization with a pulse signal from a pulse signal source 20, switches and outputs a supply voltage from a power source 11 through switching by pulse width control, smoothes it into direct-current voltage, and then outputs it to a load 13, monitor circuits 15, 16 that monitor the input/output voltage of the circuit 12, control circuits 14, 17 to 19, 21 that carry out the following processing: they determine the pulse width for switching from the relation of the monitored input/output voltage, drive the switching power supply circuit 12 with the pulse width at a first period t1 from a rising edge or a falling edge of the pulse signal, drive the switching power supply circuit 12 with the pulse width zeroed or minimized at a second period t2 following the first period, and then carry out switching control by pulse width control based on the output voltage. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a pulse power supply apparatus that requires a pulse power supply waveform, for example, in a high-frequency module for a radar transmission apparatus, and a pulse voltage generation method thereof.

  A pulse power supply device that generates a power supply voltage having a pulse waveform is used for a high-frequency module for a radar transmitter (see Patent Document 1). In this pulse power supply device, the rising or falling waveform of the power supply affects the spurious characteristics of the radar. Therefore, it is desirable that the pulse power supply apparatus always has a constant rising time against disturbances such as input fluctuations. As for the rising characteristics of such a power supply device, a method using a current limiter, a method of gradually increasing a reference voltage, and the like are generally used. However, these methods have a problem that the rise time of the power source is delayed.

JP 2007-020305 A

  As described above, in the conventional pulse power supply device, in order to make the power supply rise constant, the rise time must be delayed for the control.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pulse power supply apparatus and a pulse voltage generation method thereof that can simultaneously realize a high speed and constant rise of the power supply.

  In order to achieve the above object, a pulse power supply device according to the present invention is configured as follows.

  (1) In a pulse power supply device that generates a power supply voltage having a pulse waveform that is synchronized with a pulse signal from a pulse signal source, the power supply voltage is driven in synchronization with the pulse signal, and the power supply voltage from a constant voltage source is switched and output by pulse width control. A switching power supply circuit that smoothes the DC voltage and outputs it to a load; monitoring means that monitors the input / output voltage of the switching power supply circuit; and the relationship between the input voltage and the output voltage monitored by the monitoring means. A pulse width is determined, and the switching power supply circuit is driven with the pulse width over a first period from the rising or falling edge of the pulse signal, and the pulse width is set to 0 or the minimum width in the subsequent second period. Switching control by driving the switching power supply circuit and then pulse width control based on the output voltage A manner and a control means for performing.

  (2) In the aspect of (1), the control means is provided with a timer for notifying the timing of the first and second periods.

  (3) In the aspect of (1), the control means includes comparison means for comparing the output voltage obtained by the monitoring means with reference voltage values corresponding to the first and second periods. And

  Moreover, the pulse voltage generation method of the pulse power supply device according to the present invention is as follows.

  (4) A pulse power supply device that drives a switching power supply circuit in synchronization with a pulse signal from a pulse signal source, switches a power supply voltage from a constant voltage source by pulse width control, smoothes it to a DC voltage, and outputs it to a load. Used to monitor the input / output voltage of the switching power supply circuit, determine the pulse width of the switching from the relationship between the monitored input voltage and output voltage, and the first period from the rise or fall of the pulse signal The switching power supply circuit is driven with the pulse width over a period of time, and the switching power supply circuit is driven with the pulse width set to 0 or the minimum width in the subsequent second period, and then switching by pulse width control based on the output voltage It is set as the aspect controlled.

  According to the above configuration, when a pulse ON signal is input, the pulse signal is started at a predetermined time, set to a pulse width corresponding to the input voltage, and the switching power supply circuit is turned on to operate with a minimum duty. After that, by performing feedback control so that the output voltage becomes constant, it is possible to realize constant rising as well as high-speed rising.

  Therefore, according to the present invention, it is possible to provide a pulse power supply apparatus and a pulse voltage generation method thereof that can simultaneously realize a fast rise and constant power supply.

1 is a circuit diagram showing a configuration of a pulse power supply device according to a first embodiment of the present invention. The wave form diagram which shows each part waveform of each state in order to demonstrate the operating principle of the apparatus shown in FIG. The flowchart which shows the flow of the process performed with the arithmetic processing circuit shown in FIG. The circuit diagram which shows the structure of the pulse power supply device which is the 2nd Embodiment of this invention. 5 is a flowchart showing a flow of processing executed by the arithmetic processing circuit shown in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a circuit diagram showing a configuration of a pulse power supply device according to a first embodiment of the present invention. In FIG. 1, the positive and negative terminals of the DC voltage source 11 are connected to the positive and negative input terminals of the switching power supply circuit 12 through positive and negative power supply lines, respectively. The switching power supply circuit 12 is constituted by, for example, a DC-DC converter, stabilizes the voltage supplied from the DC voltage source 11 to a specified level voltage, and supplies the voltage to the load 13.

  Specifically, the first and second switching elements 121 and 122 are connected in series between the positive and negative power supply lines connected to the positive and negative terminals of the DC voltage source 11, and between the connection point of both elements and the load output terminal. An inductor 123 is connected, a capacitor 124 is connected between the load output terminal and the negative power supply line, and each switching element 121, 122 is controlled to be turned on / off by a drive signal from the drive circuit 14, respectively. That is, the switching power supply circuit 12 is configured to charge and discharge the capacitor 124 through the inductor 123 by alternately turning on the switching elements 121 and 122 in synchronization with a pulse signal generated by a pulse signal source 20 described later. By generating the above, it functions as a step-down converter that generates an output voltage having a pulse waveform.

  Here, the step-down converter, which is a basic circuit, is taken as an example, but other methods may be used.

  An input monitor circuit 15 using voltage dividing resistors 151 and 152 and an output monitor circuit 16 using voltage dividing resistors 161 and 162 are connected between the input terminals and the output terminals of the switching power supply circuit 12, respectively. A monitor voltage is obtained. Here, a resistor for voltage division is inserted, but when voltage division is not necessary, it may be taken out directly from the input / output terminal.

  The input monitor voltage obtained by the input monitor circuit 15 is converted into a digital signal by an A / D (analog / digital) converter 18 and supplied to the arithmetic processing circuit 19. Similarly, the output monitor voltage obtained by the output monitor circuit 16 is converted into a digital signal by the A / D converter 19 and supplied to the arithmetic processing circuit 18.

  The arithmetic processing circuit 18 takes in the pulse signal generated by the pulse signal source 20 (transmission pulse in the case of radar) and uses the timer 181 for determining the rise time and the fall time, and performs the processing shown in FIG. Execute. Data calculated by the arithmetic processing circuit 18 is converted by a PWM (Pulse Width Modulation) circuit 21 into an on time Ton and an off time Toff for determining the duty of the pulse signal. Here, the generated pulse signal is output to the drive circuit 14. The drive circuit 14 generates a drive signal to be supplied to the switching elements 121 and 122 based on the pulse signal duty-controlled by the PWM circuit 21.

  In the pulse power supply device having the above configuration, the waveform of each part in FIG. 1 is shown in FIG. In order to simplify the description, the voltage drops of the switching elements 121 and 122 and the inductor 123 and the voltage drop due to the load 13 are ignored. The operation will be described with respect to the power supply startup. The falling may be performed in the reverse order of the rising.

The input voltage is Vin, the output voltage is Vout, the switching cycle of the switching power supply circuit 12 is Tsw, the on time of the switching power supply circuit 12 is Ton, the off time of the switching power supply circuit 12 is Toff, the capacitance of the capacitor 124 is C, and the capacitor 124 Let ic be the flowing current, Q be the amount of charge stored in the capacitor 124, and L be the inductance of the inductor 123. Here, the duty D is defined by the following equation.

However, D is in the range of 0 to 1.

  As shown in FIG. 2 (a), a period for setting a constant duty at startup is defined as t1, a period for setting the minimum duty or 0 (0 in the drawing) as t2, and a period for normal operation as t3. Here, the period t2 is a period during which the energy stored in the inductor 123 during the period t1 is transmitted to the capacitor 124. When there is no period t2, overshoot occurs in the output voltage Vout. That is, this method can be started up most quickly without causing overshoot.

The activation time Trise is defined by the following equation.

Assuming that the amount of charge stored in the capacitor 124 is Q, a current ic flowing in the capacitor 124 shown in FIG. 2B is given by the following equation, as shown in FIG.

From equations (3) to (5), solving for t1 and t2 gives the following equations.

Moreover, if it solves about D from (2) Formula-(5) Formula, it will become a following formula.

From this, it can be seen that the rise time can always be made constant by changing the duty even if the input fluctuates.

  Here, the flow of the arithmetic processing performed in the arithmetic processing circuit 18 will be described with reference to FIG.

  First, input and output monitor voltages Vin and Vout are fetched from the A / D converters 17 and 19 at the start of processing (step S11), and the duty D is determined by arithmetic processing according to equations (1) to (8) (step S12). ), The process of steps S11 to S12 is repeated until a pulse signal is given from the pulse signal source 20 to enter a standby state (step S13).

  When the pulse signal is turned on in step S13, the PWM circuit 21 is activated and the duty D is set to the value determined by the equation (8) (step S14). When the timer 181 passes the time t1, the duty D is set to the minimum (or 0) (steps S15 and S16), and when the timer 181 further passes the time t2, the normal operation is resumed (steps S17 and S18).

  With the above processing, it is possible to shift to stable operation without causing overshoot while keeping the rise time constant.

(Second Embodiment)
FIG. 4 is a circuit diagram showing a configuration of a pulse power supply device according to the second embodiment of the present invention. However, in FIG. 4, the same parts as those shown in FIG. 1 are denoted by the same reference numerals, and different parts will be described here.

  In the first embodiment shown in FIG. 1, the arithmetic processing circuit 18 uses the timer 181 to determine the rise time and the fall time. On the other hand, in the second embodiment shown in FIG. 4, a comparator 22 for comparing and comparing the output voltage Vout and the reference value Vth is used instead of the timer 181, and the rise time and Determine the fall time.

That is, as shown in FIG. 2D, when the output voltage Vout at the time when the time t1 has elapsed is the reference value Vth, the following equation is obtained from the equations (3) to (5).

  Accordingly, the same operation can be performed by comparing the determination at the end of t1 with the reference value Vth by using the comparator 22 instead of the timer 201.

  The processing flow of the arithmetic processing circuit 18 in this case is as shown in FIG. That is, input and output monitor voltages Vin and Vout are taken in from the A / D converters 17 and 19 at the start of processing (step S21), and the duty D is determined by arithmetic processing according to equations (1) to (8) (step S22). ), The process of steps S21 to S22 is repeated until a pulse signal is given from the pulse signal source 20 to enter a standby state (step S23).

  When the pulse signal is turned on in step S23, the PWM circuit 21 is activated to set the duty D to the value determined by the equation (8) (step S24). From this state, when the output voltage Vout exceeds the reference value Vth, the duty D is set to the minimum (or 0) (steps S25 and S26), and the normal operation is resumed when the output voltage Vout further reaches the allowable minimum voltage value Vout-min. (Steps S27 and S28).

  By the above processing, as in the first embodiment, even when input fluctuation occurs, it is possible to make the rising time constant and shift to normal stable operation without causing overshoot.

  As described above, according to the present invention, since a constant duty is set for a fixed period at the time of startup, and then the minimum duty or 0 is set, control is performed at the time of startup so that normal operation is performed. The startup time can be made constant for input fluctuations while increasing the Vout startup time.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, according to the present invention, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

  DESCRIPTION OF SYMBOLS 11 ... DC voltage source, 12 ... Switching power supply circuit, 13 ... Load, 121, 122 ... 1st and 2nd switching element, 123 ... Inductor, 124 ... Capacitor, 14 ... Drive circuit, 15 ... Input monitor circuit, 151 152 ... Voltage dividing resistor, 16 ... Output monitor circuit, 161, 162 ... Voltage dividing resistor, 17 ... A / D (analog / digital) converter, 18 ... Arithmetic processing circuit, 181 ... Timer, 19 ... A / D converter, 20 ... Pulse signal source, 21 ... PWM (Pulse Width Modulation) circuit, 22 ... Comparator.

Claims (4)

In a pulse power supply device that generates a power supply voltage of a pulse waveform synchronized with a pulse signal from a pulse signal source,
A switching power supply circuit that is driven in synchronization with the pulse signal, and outputs a power supply voltage from a constant voltage source by switching to a DC voltage by smoothing and outputting to a load by pulse width control;
Monitoring means for monitoring the input / output voltage of the switching power supply circuit;
The switching pulse width is determined from the relationship between the input voltage and the output voltage monitored by the monitoring means, and the switching power supply circuit has the pulse width over the first period from the rising or falling edge of the pulse signal. And a control means for driving the switching power supply circuit with the pulse width set to 0 or the minimum width in the subsequent second period, and thereafter performing switching control by pulse width control based on the output voltage. A featured pulse power supply. 2. The pulse power supply device according to claim 1, wherein the control means includes a timer for notifying timings of the first and second periods. 2. The pulse power supply apparatus according to claim 1, wherein the control means includes comparison means for comparing the output voltage obtained by the monitoring means with reference voltage values corresponding to the first and second periods. . A switching power supply circuit is driven in synchronization with a pulse signal from a pulse signal source, and a power supply voltage from a constant voltage source is switched and output by a pulse width control to be smoothed into a DC voltage and output to a load.
Monitor the input / output voltage of the switching power supply circuit,
Determining the switching pulse width from the relationship between the monitored input voltage and output voltage;
Driving the switching power supply circuit with the pulse width over a first period from the rise or fall of the pulse signal;
In the subsequent second period, the switching power supply circuit is driven with the pulse width set to 0 or the minimum width,
Thereafter, switching control is performed by pulse width control based on the output voltage.

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