JPS63181663A - Dc power source - Google Patents

Abstract

PURPOSE:To reduce the overshoot and undershoot of the output voltage of a DC power source by providing an input voltage detector in the power source. CONSTITUTION:A DC power source is composed of a primary power source 1 for supplying a DC power, an energy bank 2 for storing and discharging the power, a power converter 3, and a rectifying and smoothing circuit 6, and supplies power to a load 7. Its controller is composed of a control circuit 13, a triangular wave generator 9 and an auxiliary power source 8 for supplying power thereto. In this case, an input voltage detector 14 for detecting an input voltage, varying a power to be supplied to the generator 9 and regulating the peak value of the output triangular wave VT of the generator 9 is provided. Thus, if the voltage of the power source 1 is abruptly varied, the power supplied to the generator 9 is varied to alter the peak value of the triangular wave VT, thereby reducing the influence of the input voltage fluctuation to the output voltage.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention provides a direct current power supply device that combines an inverter circuit and a rectifying and smoothing circuit to obtain a direct current output. The present invention relates to an input voltage detection circuit that aims to further reduce overshoot and undershoot of output electrons.

[Conventional technology]

FIG. 5 is a configuration diagram of a conventional DC power supply device.

+I+ is a primary power supply that supplies DC power, (2j is an energy bank that stores and releases power from the primary power supply fil, and (3) is a power conversion circuit that converts the output from energy bank (2) into power at high frequency. , (4) is a pulse transformer, (5) is a switching transistor, (6) is a rectifier/smoothing circuit that rectifies and smoothes the output of the power conversion circuit (3), (7) is a load, (81 is a control circuit) [+31. Auxiliary power supply that supplies power to the triangular wave generation circuit (9), (91
is resistance port 0).

Combination of capacitor a]l and transistor aa-I
rl Accordingly, by the on/off signal from the control circuit 031.

A triangular wave generating circuit that generates a triangular wave, 00) is a resistor that charges capacitor 011, an is a capacitor, and a4 is a capacitor 0 that is activated by an on/off signal from the control circuit OJ.
a transistor for discharging the electric charge accumulated in 11;
031 is a suppression signal that compares the triangular wave supplied from the triangular wave generation circuit (9) with the error voltage that is detected by detecting the voltage supplied to the load (7) and compares it with the reference voltage, and supplies it to the power conversion circuit (3). This is a control circuit for outputting.

In conventional devices of this type, power supplied from a primary power source (1) is temporarily stored in an energy bank (2), and the power is output as pulsed power when switching a power conversion circuit (3). Conversion circuit (supplied to 31).

The power converter circuit (3) converts the power into voltage that is stepped down or stepped up to a specified voltage, rectifies and smoothes the power in the rectifier/smoothing circuit (6), and supplies the power to the load (7).

The voltage supplied to the load (7) is detected by the control circuit uJ, and a pulse is generated by comparing the error voltage obtained by comparing it with the reference voltage with the triangular wave (VT) that is the output of the triangular wave generating circuit (9). 111iIi modulation is performed and a control signal (Vpw) is output to the power conversion circuit (3) for stabilization.

Further, power for operating the control circuit 031 and the triangular wave generation circuit (9) is supplied from an auxiliary power source (8).

Here, Figure 6 shows the fluctuation in the output voltage of the DC power supply configured as shown in Figure 5 when the primary power supply voltage fluctuates rapidly within its rating. 1 is an operation waveform diagram showing fluctuations in the primary power supply voltage, and (A) shows a transient response of the output voltage.

Further, Fig. 1 is an operating waveform diagram of the trough when the primary power supply voltage rises rapidly in the DC power supply device configured as shown in Fig. 5, and Fig. 8 is an operation waveform diagram of the valley when the primary power supply voltage rises rapidly. FIG. 4 is an operation waveform diagram of the valley when the voltage suddenly decreases.

In Figures 7 and 8, (a) is the fluctuation of the primary power supply voltage, (b) is the transient response of the output voltage, and (ii) is the error voltage (VE) when the output voltage is detected and compared with the reference voltage. and.

The operating waveform diagram of the triangular wave (VT) which is the output of the triangular wave generation circuit (9), (1) is the output of the control circuit (131),
The control signal (Vp
w) is an operation waveform diagram.

In this way, in the DC power supply device configured as shown in FIG. Shoot: It has the disadvantage of undershoot.

[Problem that the invention seeks to solve]

Conventional DC power supplies are configured as described in +fTJ, so if there is a sudden change in the primary power supply voltage, the control
There is a problem in that overshoot and undershoot occur due to phase compensation and transmission delay in the circuit 031.

This invention was made to solve these problems, and is concerned with reducing open neatness and undershoot.

[Means for solving problems]

The DC power supply device according to the present invention aims to reduce overshoot and undershoot caused by phase compensation, transmission delay, etc. in the control circuit 031.

This is the one with the addition of a human power detection circuit α.

[For production]

In this invention, by providing a human-powered electronic detection circuit α in the DC power supply device, overshoot of the output voltage due to sudden fluctuations in the primary power supply voltage can be prevented.

This aims to reduce undershoot.

[Embodiment] Fig. 1 shows an embodiment of the present invention (11 to 03 are the same as or equivalent to the conventional device described above, and α detects the input voltage and supplies it to the triangular wave generation circuit 19). The output power of the triangular wave generator circuit (9) is changed to generate a triangular wave
) is a current limiting resistor, αQ is a diode, aη is a detector that compares the input terminal with a reference voltage generated by a constant voltage diode, and QID is a constant voltage diode. be.

In the DC power supply device configured as described above, the power supplied from the primary power supply (1) is
), and is supplied to the power converter circuit (3) as pulsed power when the power converter circuit (3) switches. This power converter circuit (3) converts the power into voltage that is stepped down or stepped up to a specified voltage, rectifies and smoothes the power in a rectifier/smoothing circuit (6), and supplies the power to a load (7).

The voltage supplied to the load (7) is determined by the error voltage (VE) obtained by comparing the output voltage detected by the control circuit (13) with the reference voltage, and the triangular wave (VT) which is the output of the triangular wave generating circuit +91. By comparing the voltage and voltage, pulse width modulation is performed and a control signal (V pw) is output to the power conversion circuit (3), thereby stabilizing the power.

Further, power for operating the control circuit [1~] is supplied from an auxiliary power source (8).

In this way, it normally operates in the same way as a conventional DC power supply. However, the power to operate the triangular wave generation circuit (9) is supplied via the input voltage detection circuit α (a) and the auxiliary power supply (
8) Supplied by

Here, Figure 2 shows the operation of each part when the primary power supply voltage suddenly increases, and Figure 3 shows the operation of the valley when the primary power supply voltage suddenly decreases. be.

In Figures 2 and 3, (a) is the fluctuation of the primary power supply voltage, (b) is the transient response of the output voltage, and (ii) is the error obtained by detecting the output voltage and comparing it with the reference voltage. Operation waveform diagram of the voltage (v8) and the triangular wave (VT) that is the output of the triangular wave generating circuit (9), (1) is the output of the control circuit a3, and is the distribution control signal obtained by comparing VT and vE. (Vpw) is an operation waveform diagram.

In the DC power supply device configured as shown in FIG. ) by changing the power supplied to
The peak value of the triangular wave (VT) generated by the triangular wave generating circuit α1 is changed.

Therefore, as shown in FIG. 4, the response to fluctuations in the primary power supply voltage is faster than in the conventional DC power supply device shown in FIG. 5, so that the influence on the output voltage can be further reduced. Note that in FIG. 4, (A) shows fluctuations in the primary power supply voltage. (A) shows a comparison of the output voltage fluctuations of the DC power supply configured as shown in Figure 1 and the DC power supply configured as shown in Figure 5. The broken line indicates the output voltage of the DC power supply configured as shown in FIG.

〔Effect of the invention〕

This invention has three points as explained above: By providing an input voltage detection circuit +14+ in the DC power supply device, it is possible to reduce overshoot and undershoot of the output voltage due to sudden fluctuations in the primary power supply voltage. have an effect.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a circuit example of a DC power supply device to which this invention is applied, FIGS. 2 and 3 are diagrams for explaining the operation of a DC power supply device to which this invention is applied, and FIG. A diagram comparing the output voltage waveform of a DC power supply device and the output voltage waveform of a DC power supply device to which the present invention is applied. Figure 5 is a diagram showing an example of a conventional circuit. Figures 6 and 7 are diagrams of a conventional DC power supply. FIG. 8, which is a diagram for explaining the operation of the device, is a diagram showing the output voltage waveform of a conventional DC power supply device. In the figure, (1) is the primary power supply, (2J is the energy bank, (
3) is a power conversion circuit, (4) is a transformer, (51+I
Z is a transistor, (6) is a rectifier/smoothing circuit, (7) is a load, (8) is an auxiliary power supply, (9) is a triangular wave generation circuit, α
1α9 is a resistor, 011 is a capacitor, 03 is a control circuit,
+14 is an input voltage detection circuit. ae is a diode, σ is a detection '5. uB is a constant voltage diode. 2. The same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] an energy bank that stores and releases power; a primary power source that supplies power to the energy bank; a power conversion circuit that receives pulsed current from the energy bank and converts power at high frequency; a rectification/smoothing circuit that rectifies and smoothes the output; a control circuit that detects the output of the rectification/smoothing circuit and controls the voltage supplied to the load by comparing it with a triangular wave supplied from the triangular wave generation circuit; an auxiliary power supply that supplies power to the control circuit, the triangular wave generation circuit, and the input voltage detection circuit; a triangular wave generation circuit that supplies the triangular wave to the control circuit; and a triangular wave generation circuit that detects the primary power supply voltage and changes the power supplied to the triangular wave generation circuit. What is claimed is: 1. A direct current power supply device comprising: an input voltage detection circuit for detecting an input voltage;