JPS63157669A - Dc power converter - Google Patents

Abstract

PURPOSE:To achieve high efficiency, by constituting a DC power converter where a voltage dropping section to drop DC input voltage and a boosting section to boost it are provided. CONSTITUTION:A DC power converter is made up of a main circuit section A and a control circuit section B. The main circuit A is composed of a voltage dropping section C comprising a transistor (hereinafter referred to as Tr) 9a, a reactor 11 and the 1st diode 12a and of a boosting section D comprising a Tr 9b, the 2nd diode 12b and the abovementioned reactor 11. On the other hand, the control circuit section B is equipped with the 1st-2nd control loops E and F and composed of matching circuits 16a-16d, the 1st-the 2nd voltage control amplifiers 17a-17b, a triangular wave generator 18, the 1st and the 2nd comparators 19a-19b and the 1st-the 2nd gate circuits 20a-20b. In voltage dropping mode, the output voltage V2 is controlled to drop by ON-OFF controlling the Tr 9a with the 1st control loop E, while in boosting mode, it is controlled to boost by ON-OFF controlling the Tr 9b (N.B.: Tr 9a is kept on turning ON.) with the 2nd control loop F.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a power conversion device, and more particularly to a DC TLw converter that is capable of converting both a DC voltage step-down and an η1 voltage.

B9 Summary of the Invention The present invention provides a power conversion device that steps down or steps up the direct output voltage by on/off controlling the inlet Jm voltage of the DC, and the power conversion device is provided with a step-down section and a step-up section, By controlling the booster section and the booster section, it is possible to obtain a highly efficient DC voltage converter with little circuit loss.

C6 PRIOR TECHNOLOGY In conventional DC voltage converters, separate devices are used for lowering the voltage and boosting the voltage, as shown in FIGS. 3 and 4, for example.

Figure 3 shows the main circuit of a step-down chopper for lowering the voltage, in which 1 is a switching section that is provided at the DC input and consists of transistors, etc., 2 is a DC reactor connected after the output of the switching section 1, and 3 is a loop prevention circuit. The diode 4 is a capacitor provided after the DC output. In the chopper shown in FIG. 3, the switching section 1 is turned on and off, whereby the output voltage (2) is stepped down relative to the input voltage (1).

Figure 4 shows a boost chopper for raising the voltage.
A DC reactor 2 is connected to the DC input side, a diode 3 is connected to DC to the reactor 2, and a switching unit 1 is connected between the connection point between the reactor 2 and the diode 3 and the negative electrode of the power supply. In the chopper shown in FIG. 2, the output voltage v2 is lowered with respect to the input voltage Vl by turning on and off the switching section l.

D9 Problems to be Solved by the Invention In the conventional power conversion system, the step-down circuit and the step-up circuit must have separate circuit configurations, so the circuits must be selected depending on the purpose of use. This has the disadvantage that power loss in each circuit increases and efficiency decreases.

E1 Means for Solving Problems The present invention has been made in view of the above-mentioned problems, and includes a step-down section including a first switching section that turns on and off the DC input voltage and steps down the DC output voltage; A step-up section having a second switching section that boosts the DC input voltage by turning on and off the DC input voltage, and a detection voltage signal obtained by detecting the DC output voltage signal and a set voltage signal to generate a first deviation. A first deviation signal obtained by obtaining a signal and comparing a second deviation signal between the first deviation signal and the triangular wave voltage signal with a reference signal.
a first control loop that controls the first switching section using a gate signal; a third deviation signal obtained from the first deviation signal and the set voltage signal; and an inversion of the third deviation signal. a second control loop that controls the second switching unit by a second gate signal obtained by comparing the signal and a fourth deviation signal based on the peak value of the triangular wave voltage signal with the base voltage signal; The present invention provides a DC power converter with

F. EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2.

Figure 1 also shows the circuit of the DC power converter according to this embodiment.
This DC power converter essentially consists of a main circuit section A and a control circuit section B.

To the main circuit section, the positive input terminal 5 is connected to the collector 7 [
A first switching unit 10a consisting of a transistor 9a with its poles connected, a DC-connected adle 11 to the emitter electrode of the transistor 9a, and a cathode electrode connected to the connection point between the emitter electrode of the transistor 9a and the adle 11, and an anode electrode. A step-down section C is constituted by the first diode 12a connected to the negative input terminal 6 side. Further, 10b is a second switching section consisting of a transistor 9b, and 12b is a second diode. The anode electrode of the diode 12b is connected to the reactor 11, the cathode electrode of the transistor 9b is connected to the connection point between the reactor 11 and the diode 12b, and the emitter electrode of the transistor 12b is connected to the negative input terminal 6 side. Therefore, reactor 11. The second switching section 10b and the second diode 12b constitute a boosting section. 13 is a capacitor.

The control circuit section B is composed of a first control loop E and a second control loop F. The first control loop E includes an output voltage detector 14. First base ω voltage setter 15. Matching circuit IGa, 16b, first voltage controlled amplification A:i 178
．． Triangle wave generator 18. It is composed of a first comparator 19a and a first gate circuit 20a. Further, the second control loop F includes matching circuits 16c and 16d, a second voltage control amplifier 17b, a second comparison circuit 19b, and a second gate circuit 20b.

Next, the step-down operation and step-up operation in the above-mentioned one-way power converter will be explained with reference to FIGS. 1 and 2.

In the case of step-down mode, the detection signal S of the output voltage detector 14
1 and the setting voltage signal Vs of the voltage setting device 15.
6a and are compared, and this deviation value is amplified by the first voltage control amplifier. The amplified deviation signal S is matched with the triangular wave signal S from the triangular wave generating circuit 18 by the matching circuit 16b.
and the deviation signal is sent to the first comparator (CP+).
A signal S4 is obtained by comparison at l 9 a. Signal S4 °
The first gate circuit (GCI) 20a is manually operated to turn on and off the transistor 9a according to the gate signal S5, thereby controlling the output voltage V to drop.

In the step-up mode, the matching circuit 16c sets the deviation amplification signal S to the set voltage signal -Vs, and sets the set voltage signal -Vs to the set voltage signal -Vs.
is added and the deviation signal S5 is sent to the second voltage control amplifier 19.
b to obtain a signal S6, and this signal S6 is converted into a reference signal S by a second comparator 19b.

Compare with to obtain gate signal S7. The gate signal S7 is manually applied to the second gate circuit 20b, and the transistor is turned on and off by the output signal S8.

In this case, there is no intersection between the signal S2 and the triangular wave signal S3, and the transistor 9a is kept in continuous conduction.
Only voltage b is turned on and off by signal S9 and boosted.

11. Effects of the Invention The present invention is as described above, and includes a step-down section that steps down a DC input voltage to obtain a DC output voltage, and a step-up section that steps up the DC input voltage and obtains a DC output voltage. Since the DC power converter is made up of +14, the circuit configuration of the control section is simplified, the total loss of the circuit is low, and a highly efficient and economical power converter can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a DC power converter according to an embodiment of the present invention, FIGS. 2(A) to (C) are diagrams explaining its operation, and FIGS. 3 and 4 are respectively conventional DC power converters. FIG. 9a...first transistor, 10a...first switching section, 9b...second transistor, tab
... second switching section, 11 ... reactor,
112゜12b...Diode, 14...Voltage detector, 15...First voltage setter, lea~16d...
- Matching circuit, 17a, 17b...voltage control amplifier, 18...triangular wave generation circuit, 19a, 19b=...comparator, 20 a, 20 b...-gate circuit, A...
Main circuit section, B... control section, E... first control loop, F... second control loop. Figure 3 Figure 4

Claims (1)

[Claims] a step-down section including a first switching section that turns on and off the DC input voltage to step down the DC output voltage; and a step-up section that has a second switching section that turns on and off the DC input voltage to step up the DC input voltage. , a first deviation signal is obtained from the detection voltage signal obtained by detecting the DC output voltage signal and the set voltage signal, and a second deviation signal from the first deviation signal and the triangular wave voltage signal is used as a reference signal. a first control loop that controls the first switching unit using a first gate signal obtained by comparing; a third deviation signal based on the first deviation signal and the set voltage signal; A second gate signal that controls the second switching unit by a second gate signal obtained by comparing an inverted signal obtained by inverting the deviation signal of the first deviation signal, a fourth deviation signal based on the peak value of the triangular wave voltage signal, and the reference voltage signal. A DC power converter comprising a control loop.