JP6735846B2 - Power supply circuit device - Google Patents

Description

The present invention relates to a power supply circuit device, and more particularly to a power supply circuit device used in a power conversion device that drives a vehicle drive rotating electric machine.

Since it is necessary to provide a plurality of power supply voltages to the power converter that drives the vehicle driving rotating electrical machine, the power converter includes a power supply circuit device having a plurality of transformers (Patent Document 1).

In the two transformers connected in series, the input energy of the two transformers differs depending on the variation in the self-inductance of the winding connected to the input side power supply. Also, the output energy of both transformers varies depending on the variation in the power consumption of the output side load. The larger the input energy, the higher the voltage of the output side load, and the larger the output energy, the lower the voltage of the output side load.

In this way, when the self-inductance and the power consumption of the load vary, the balance of the input energy and the output energy is different between the two transformers. Therefore, in the case of the power supply circuit described in the patent document, the output voltage will be different.

JP, 2010-284029, A

An object of the present invention is to reduce the variation in the self-inductance and the variation in the voltage of the output side load caused by the variation in the power consumption of the load, and improve the reliability of the power supply circuit device.

A flyback power supply circuit device according to the present invention includes a first transformer, a second transformer in which windings connected to an input power supply are connected in series together with the first transformer, a first diode, and a second diode. , wherein the first transformer has a first winding connected to the input power source, and a second winding connected between the first output load, and a third winding, a second transformer, wherein A fourth winding connected to the first winding in series, a fifth winding connected to the second output load, and a sixth winding, wherein the third winding and the sixth winding are The first diode is connected in parallel to a power consuming circuit that consumes the power of the first transformer and the second transformer, and the first diode is provided between the third winding and the power consuming circuit from the third winding. The second diode is connected between the sixth winding and the power consuming circuit such that the current flowing toward the power consuming circuit is in the forward direction. There is connected in a forward direction, the case where the output voltage of the first output load is higher than the output voltage of the second output load, said power than the more power the third winding said sixth winding is supplied to the circuit, the case where the output voltage of the second output load is higher than the output voltage of the first output load supplies more power than the sixth winding said third winding to said power circuit.

According to the present invention, the reliability of the power supply circuit device can be improved.

3 is an overall circuit configuration diagram centering on the power supply circuit 100. FIG. FIG. 2 is a circuit configuration diagram of a part of a power supply circuit 100 centering on a transformer 121 and a transformer 125 of FIG. 1. 3 is an operation flow of the circuit shown in FIG. 2.

Before entering the embodiment of the present invention, the principle of the present embodiment will be described below.

In this embodiment, one winding of two transformers connected in series is connected in parallel to the power consumption circuit. Regarding the power consumption circuit, the power supplied by the transformer with the larger output voltage is increased.

As a result, the power consumption by the power consumption circuit is concentrated on the side with the larger output voltage, and the output energy of the transformer with the larger output voltage is increased, thereby lowering the output voltage and reducing variations in the output voltage.

That is, it is possible to reduce variations in the self-inductance of the windings connected to the input side power supply of the two transformers connected in series and variations in the voltage of the output side load when the power consumption of the output side load of the transformers is different.

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

FIG. 1 is an overall circuit configuration diagram centering on the power supply circuit 100.

The power supply circuit 100 includes a starting circuit 101, a power supply IC 103, a diode 104 and a diode 105, a resistor 106, a zener diode 107, a voltage monitoring circuit 108, a voltage dividing resistor 109, a transistor 110, a transformer 121, and a transformer. 125, a diode 111, a diode 114, a diode 119 and a diode 120, and a capacitor 112 and a capacitor 115.

The power supply circuit 100 is a flyback type power supply circuit that boosts or lowers the voltage of the battery 102 and supplies power to the load 113 and the load 116.

The starting circuit 101 is a circuit which is supplied with power from the battery 102 and temporarily supplies power to the power supply IC 103. As the battery 102, a nickel hydrogen battery, a lithium ion battery, or the like is used.

The contactor 117 connects or disconnects the battery 102 and the smoothing capacitor 118.

The power supply IC 103 monitors the voltage divided by the voltage dividing resistor 109 in the voltage monitoring circuit 108 and transmits an on/off signal to the transistor 110 so as to keep the voltage constant.

The diode 104 and the diode 105 supply power to the power supply IC 103 from the battery 102 via the start-up circuit 101 at the time of start-up, and supply power to the power supply IC 103 from the capacitor when the capacitor in the voltage monitoring circuit 108 exceeds a predetermined voltage after start-up. Configure the circuit of.

The resistor 106 adjusts the current supplied to the power supply IC 103. The Zener diode 107 is for clamping the voltage applied to the power supply terminal of the power supply IC 103.

The transformer 121 is composed of three windings: a winding 122 connected to the battery 102 side, a winding 123 connected to the voltage monitoring circuit 108, and a winding 124 connected to the load 113 side.

Like the transformer 121, the transformer 125 is composed of three windings, a winding 126 connected to the battery 102 side, a winding 127 connected to the voltage monitoring circuit 108, and a winding 128 connected to the load 116 side. It For example, the winding 122 is the first winding, the winding 124 is the second winding, the winding 123 is the third winding, the winding 126 is the fourth winding, the winding 128 is the fifth winding, and the winding 127. Corresponds to the sixth winding.

The winding 122, the winding 126 are connected in series, the winding 123 is connected in parallel to the voltage monitoring circuit 108 via the diode 119, and the winding 127 is connected in parallel to the voltage monitoring circuit 108.

The transistor 110 stores energy in the windings 122 and 126 of the transformer 121 and the transformer 125 when conducting. The energy stored in the winding on the battery side when the transistor 110 is cut off is transmitted to the load 113 and the load 116 via the cores and gaps of the transformer 121 and the transformer 125.

The diode 111 and the diode 114 cut off the currents of the windings of the transformer 121 and the transformer 125 when the transistor 110 is on, and are on when the transistor 111 is off to charge the capacitor 112 and the capacitor 115.

The capacitors 112 and 115 are for stabilizing the voltage applied to the loads 113 and 116.

FIG. 2 is a circuit configuration diagram of a part of the power supply circuit 100 centering on the transformer 121 and the transformer 125 of FIG. FIG. 3 is an operation flow of the circuit shown in FIG.

Vout1 shown in FIG. 2 is the output voltage of the transformer 121, that is, the voltage of the capacitor 112. Vout2 is the output voltage of the transformer 125, that is, the voltage of the capacitor 115. Vfd1 is the forward voltage of the diode 119. Id1 is a current flowing through the diode 119. Vfd2 is the forward voltage of the diode 120. Id2 is a current flowing through the diode 120.

The operation flow of FIG. 3 describes the flow until the voltage difference between Vout1 and Vout2 decreases when Vout1 is larger than Vout2.

It is assumed that Vout1 is larger than Vout2, that is, the self-inductance of the winding 122 is larger than the self-inductance of the winding 126, or the power consumption of the load 113 is smaller than that of the load 116.

In this case, the voltage of the winding 123 of the transformer 121 becomes higher than the voltage of the winding 127 of the transformer 125. As a result, the forward voltage Vfd1 of the diode 119 becomes higher than the forward voltage Vfd2 of the diode 120.

Here, due to the forward voltage and forward current characteristics of the diode, the forward current increases as the forward voltage increases, so the current Id1 of the diode 119 becomes larger than the current Id2 of the diode 120.

As a result, of the power consumed by the voltage monitoring circuit 108, the power supplied by the transformer 121 is larger than that supplied by the transformer 125. As a result, the output energy of the transformer 121 increases and Vout1 decreases. That is, the voltage monitoring circuit 108 functions as a power consumption circuit. Although the voltage monitoring circuit 108 is made to function as the power consumption circuit in the present embodiment, a circuit having another function may be made to function as the power consumption circuit. In particular, if the voltage monitoring circuit 108 provided around the transformer 121 and the transformer 125 is made to function as a power consumption circuit, wiring is facilitated, and an increase in size of the device can be suppressed.

When Vout2 is larger than Vout1, the voltage of Vout2 decreases in the same flow as when Vout1 is larger than Vout2. From the above, variations in output voltage can be reduced.

100... Power supply circuit, 101... Start-up circuit, 102... Battery, 103... Power supply IC, 104... Diode, 105... Diode, 106... Resistor, 107... Zener diode, 108... Voltage monitoring circuit, 109... Voltage dividing resistance, 110... Transistor, 111... Diode, 112... Capacitor, 113... Load, 114... Diode, 115... Capacitor, 116... Load, 117... Contactor, 118... Smoothing capacitor, 119... Diode, 120... Diode, 121... Transformer, 122... Winding Wire, 123... winding, 124... winding, 125... transformer, 126... winding, 127... winding, 128... winding

Claims (2)

A flyback power supply circuit device,
The first transformer,
A second transformer in which windings connected to an input power source are connected in series together with the first transformer;
A first diode,
A second diode ,
The first transformer has a first winding connected to the input power source, and a second winding connected between the first output load, and a third winding, and
The second transformer includes a fourth winding connected in series with the first winding, a fifth winding connected to a second output load, and a sixth winding,
The third winding and the sixth winding are connected in parallel to a power consuming circuit that consumes power of the first transformer and the second transformer,
The first diode is connected between the third winding and the power consuming circuit such that a current flowing from the third winding toward the power consuming circuit is in a forward direction.
The second diode is connected between the sixth winding and the power consuming circuit such that a current flowing from the sixth winding toward the power consuming circuit is in a forward direction.
Wherein when the output voltage of the first output load is higher than the output voltage of the second output load, the third winding supplies more power than the sixth winding to said power circuit,
Wherein when the output voltage of the second output load is higher than the output voltage of the first output load, the power supply circuit unit for supplying power the sixth winding is larger than the third winding to the power consumption circuit. The power supply circuit device according to claim 1, wherein
The power consumption circuit device, wherein the power consumption circuit has a function of detecting the voltage of the first output load and the voltage of the second output load in the previous period .

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