JP2020162222A - Backup power supply control device and backup power supply apparatus - Google Patents

Abstract

To provide a backup power supply control device capable of controlling a power supply voltage by itself, and a backup power supply apparatus.SOLUTION: A backup power supply control device A adjusts the voltage of battery power inputted from the outside, and supplies the adjusted battery power as backup power to a power reception side B. The backup power supply control device A includes a power transformer 1 having one end of a primary winding to which the battery power is supplied, a rectification circuit 2 that has a pair of input ends respectively connected to both ends of a secondary winding of the power transformer 1 and that generates backup power of a prescribed supply voltage, conversion circuits 4, 5 that each generate a conversion permission signal by electrically isolating a permission signal inputted from the power reception side B, a power switching element 7 having an output end connected to the other end of the primary winding, and a control circuit 6 that generates a PWM signal for driving the power switching element 7 by comparing the supply power voltage with a prescribed target voltage on the basis of the conversion permission signal.SELECTED DRAWING: Figure 1

Description

The present invention relates to a backup power supply control device and a backup power supply device.

Patent Document 1 below discloses a voltage resonance type power supply device that supplies electric power to a control circuit based on a PWM1 signal, a PWM2 signal, and a PWM3 signal input from the control circuit. That is, this voltage resonance type power supply device controls the primary side current of the transformer based on the PWM1 signal, and controls the secondary side current of the transformer based on the PWM2 signal and the PWM3 signal. The PWM1 signal is a control signal for the control circuit to transmit a power supply request to the voltage resonance type power supply device, and the PWM2 signal and the PWM3 signal are control signals for controlling the power supply voltage with.

JP-A-2003-09524

By the way, in the above-mentioned conventional technique, the voltage (feeding voltage) of the electric power supplied from the voltage resonance type power supply device (feeding side) to the control circuit (power receiving side) is controlled by the receiving side. Therefore, there is a problem that it becomes difficult for the power supply side to supply the power of the normal power supply voltage to the power reception side when some failure occurs in the PWM2 signal and PWM3 signal generation circuits on the power reception side. Such a problem is an important technical problem that cannot be overlooked by a backup power supply device that supplies power to the power receiving side when the main power supply is abnormal.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a backup power supply control device and a backup power supply device capable of controlling the power supply voltage by itself.

In order to achieve the above object, in the present invention, as a first solution relating to the backup power supply control device, the voltage of the battery power input from the outside is adjusted, and the adjusted battery power is received as the backup power. A backup power control device that supplies power to the side, in which a power transformer in which the battery power is supplied to one end of the primary winding and a pair of input ends are connected to both ends of the secondary winding of the power transformer. A rectifying circuit that generates the backup power of the power supply voltage of the above, a conversion circuit that generates a conversion permission signal by electrically isolating the permission signal input from the power receiving side, and an output end of the primary winding. It includes a power switching element connected to the other end and a control circuit that generates a PWM signal for driving the power switching element by comparing the power supply voltage with a predetermined target voltage based on the conversion permission signal. Adopt the means.

In the present invention, as a second solution for the backup power supply control device, in the first solution, the permission signal is a pulse signal, and the conversion circuit is a signal obtained by isolating the pulse signal. Is provided, and an EN signal generation circuit for generating the conversion permission signal is provided.

In the present invention, as a third solution according to the backup power supply control device, in the second solution, the conversion circuit includes a transformer that isolates the pulse signal.

In the present invention, as a fourth solution according to the backup power supply control device, in any one of the first to third solutions, the power transformer includes a second secondary winding, and the control circuit , The means of taking in the voltage obtained by rectifying the output of the second secondary winding by the second rectifier circuit as the feed voltage is adopted.

In the present invention, as a fifth solution for the backup power supply control device, in any of the first to fourth solutions, the control circuit uses the battery power as a power source.

Further, the present invention includes a battery and a backup power supply control device according to any one of the first to fifth solutions for capturing the output of the battery as the battery power as a solution for the backup power supply device. The means is adopted.

According to the present invention, it is possible to provide a backup power supply control device and a backup power supply device capable of controlling the power supply voltage by itself.

It is a circuit diagram which shows the functional structure of the backup power supply control device which concerns on one Embodiment of this invention. It is a timing chart which shows the operation of the backup power supply control device which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the backup power supply control device A according to the present embodiment adjusts the voltage of the battery power input from the external backup battery (not shown) via the positive electrode bus and the negative electrode bus, and adjusts the voltage. It is a device that supplies the later battery power as backup power to the control device B (power receiving side). The backup power supply device according to the present embodiment is a device including the backup battery and the backup power supply control device A.

As shown in FIG. 1, such a backup power supply control device A includes a power transformer 1, a first rectifier circuit 2, a second rectifier circuit 3, a transformer 4, an EN signal generation circuit 5, a control circuit 6, and a transistor 7. It has.

Among the components of the backup power supply control device A, the transistor 7 corresponds to the power switching element of the present invention. Further, the transformer 4 and the EN signal generation circuit 5 constitute the conversion circuit of the present invention.

The power transformer 1 is a transformer including a primary winding m1, a first secondary winding m2, and a second secondary winding m3, and a positive electrode bus, that is, a positive electrode of a backup battery is one end of the primary winding m1. It is connected to the. That is, battery power is supplied to one end of the primary winding m1 in the power transformer 1 via the positive electrode bus.

The other end of the primary winding m1 is connected to the collector terminal of the transistor 7. Further, both ends of the first secondary winding m2 are connected to a pair of input ends of the first rectifier circuit 2. Further, both ends of the second secondary winding m3 are connected to a pair of input ends of the second rectifier circuit 3.

The first rectifier circuit 2 includes a pair of input ends and a pair of output ends, the pair of input ends are connected to both ends of the first secondary winding m2, and the pair of output ends is the control device B. It is connected to the BU power supply terminal and the GND terminal of the above. The first rectifier circuit 2 generates backup power having a predetermined feed voltage by rectifying the AC power input from the first secondary winding m2, and supplies the backup power to the control device B.

The second rectifier circuit 3 includes a pair of input ends and a pair of output ends, the pair of input ends are connected to both ends of the second secondary winding m3, and one of the pair of output ends controls. It is connected to the first control terminal of the circuit 6, and the other of the pair of output ends is connected to the negative electrode bus, that is, the negative electrode of the backup battery. The second rectifier circuit 3 supplies power to the control circuit 6 by rectifying the AC power input from the second secondary winding m3, and supplies a detection voltage corresponding to the feed voltage to the control circuit 6. Output.

The transformer 4 includes a primary winding m4 and a secondary winding m5, both ends of the primary winding m4 are connected to the control device B (power receiving side), and both ends of the secondary winding m5 are EN signal generation circuits 5. It is connected to each of the pair of input ends of. The transformer 4 electrically isolates a continuous pulse-shaped permission signal (pulse signal) input from the control device B (power receiving side) to the primary winding m4 and transmits it to the secondary winding m5. That is, the transformer 4 outputs a pulse signal corresponding to the electrically isolated permission signal from the secondary winding m5 to the EN signal generation circuit 5.

The EN signal generation circuit 5 includes a pair of input ends and a pair of output ends, the pair of input ends are each connected to the secondary winding m5 of the transformer 4, and one of the pair of output ends is the first of the control circuit 6. 2 Connected to the control terminal, the other of the pair of output ends is connected to the negative electrode bus, that is, the negative electrode of the backup battery. The EN signal generation circuit 5 includes a rectifier circuit and a discharge circuit (not shown), and a conversion permission signal (EN) is obtained by rectifying the permission signal (pulse signal) input from the secondary winding m5 of the transformer 4 by the rectification circuit. (Signal) is generated, and the EN signal is output to the second control terminal of the control circuit 6.

For example, the rectifier circuit is composed of a diode and a capacitor, the conversion permission signal (pulse signal) output from the signal terminal of the control device B is rectified by the diode, and the rectified conversion permission signal (pulse signal) is a capacitor. Charge to. The control circuit 6 determines that the conversion permission signal (EN signal) is in the ON state when the voltage of the capacitor is equal to or higher than a predetermined voltage. Further, the discharge circuit discharges the electric charge charged in the capacitor, and when the voltage of the capacitor becomes less than a predetermined voltage, the control circuit 6 determines that the EN signal is in the OFF state. In this way, the control circuit 6 determines that the conversion permission signal (EN signal) has been transmitted from the control device B based on the voltage stored in the capacitor.

The control circuit 6 includes a first control terminal, a second control terminal, and one output terminal, the first control terminal is connected to one of the output terminals of the second rectifier circuit 3, and the second control terminal generates an EN signal. It is connected to one of the output terminals of the circuit 5, and the output terminal is connected to the base terminal of the transistor 7. The control circuit 6 controls the transistor 7 based on the EN signal input to the second control terminal. That is, when the EN signal exceeds a predetermined threshold voltage, the control circuit 6 starts ON / OFF drive of the transistor 7.

Further, the control circuit 6 generates a PWM signal for driving the transistor 7 ON / OFF by comparing the detection voltage input to the first control terminal with a predetermined target voltage. That is, the control circuit 6 sets the duty ratio of the PWM signal so that the detection voltage, that is, the feed voltage of the backup power becomes equal to the target voltage.

Further, the control circuit 6 includes a power supply terminal. As shown in the figure, this power supply terminal is connected to the positive electrode bus, that is, the positive electrode of the backup battery. That is, the control circuit 6 is an electronic circuit that operates using battery power as a power source. The above-mentioned threshold voltage and target voltage are control parameters held (stored) inside the control circuit 6.

The transistor 7 is a bipolar transistor including a base terminal, an emitter terminal, and a collector terminal. The base terminal is connected to the output terminal of the control circuit 6, the emitter terminal is connected to the negative electrode bus, that is, the negative electrode of the backup battery, and the collector terminal is connected to the other end of the primary winding m1 of the power transformer 1. There is.

The transistor 7 is an electronic switch that turns ON / OFF based on a PWM signal. That is, the transistor 7 energizes the primary winding m1 of the power transformer 1 in the ON state to energize a temporary current due to battery power, and cuts off the energization of the temporary current in the OFF state.

Further, the control device B described above includes at least a power supply terminal, an IGA terminal, a BU power supply terminal, a signal terminal, and two GND terminals, and controls the vehicle in an integrated manner. The power supply terminal is connected to the output terminal of the main battery C, and the IGA terminal is connected to one of the pair of output terminals of the IGA switch D.

Further, the BU power supply terminal is connected to one of the pair of output terminals of the first rectifier circuit 2, and the signal terminal is connected to one end of the primary winding m4 of the transformer 4. Further, one of the two GND terminals is connected to the other of the pair of output terminals of the first rectifier circuit 2, and the other GND terminal is connected to the other end of the primary winding m4 of the transformer 4. ing.

Such a control device B is an electronic circuit that normally operates based on the main power supplied from the main battery C to the power supply terminal, and when an IGA signal is input from the IGA switch D to the IGA terminal, the signal terminal By outputting the permission signal, the backup power supply control device A is requested to supply the backup power, and the backup power supply control device A operates based on the backup power input to the BU power supply terminal.

The IGA switch D is a control switch that turns ON / OFF based on a detection signal input from the collision detection unit E. The collision detection unit E is a functional component in the battery ECU that detects a vehicle collision. That is, the above-mentioned control device B outputs a permission signal to the backup power supply control device A when the vehicle collides, and receives the backup power supply.

Next, the operations of the backup power supply control device A and the backup power supply device according to the present embodiment will be described in detail with reference to FIG.

The backup power supply control device A is constantly input with the battery power of a predetermined battery voltage shown in the waveform at the top of FIG. 2 from the backup battery. This battery power is supplied to one end of the primary winding m1 of the power transformer 1, and a pulsed primary current flows through the primary winding m1 based on ON / OFF of the transistor 7 connected to the other end. .. Then, when this primary current flows, an electromotive force based on electromagnetic induction is generated in the first secondary winding m2 of the power transformer 1, and the backup power of a predetermined feed voltage is output to the control device B.

Here, the primary current in the power transformer 1 is energized by the transistor 7 supplying a PWM signal to the other end of the primary winding m1. Then, the output of the PWM signal to the transistor 7 is started when the EN signal input to the control circuit 6 exceeds the threshold voltage. Then, as shown in the waveforms of the second stage and the second stage of FIG. 2, the EN signal starts to output the permission signal (pulse signal) from the control device B to the transformer 4, and the permission signal (pulse) is started. The signal) is generated by being rectified by the EN signal generation circuit 5.

Further, as shown in the waveform of the fourth stage of FIG. 2, the control circuit 6 starts outputting the PWM signal to the transistor 7 when the level of the EN signal exceeds the threshold voltage. Then, as a result, a primary current flows through the power transformer 1, and backup power having a predetermined feed voltage is supplied to the control device B. That is, the backup power is supplied to the control device B from the period when the level of the EN signal exceeds the threshold voltage, that is, from the time t1 to the time t2.

Further, since the feed voltage of such backup power depends on the time average value of the primary current in the power transformer 1, it is adjusted by the duty ratio in ON / OFF of the transistor 7, that is, the duty ratio of the PWM signal. With respect to this duty ratio, the control circuit 6 sets the detection voltage input from the second rectifier circuit 3 to be equal to the target voltage. As a result, the feed voltage of the backup power is controlled to be equal to the target voltage.

That is, the start of supply of the backup power to the control device B is determined by the EN signal generated by the transformer 4 and the EN signal generation circuit 5 and the threshold voltage uniquely held by the control circuit 6. Further, the feed voltage of the backup power depends on the detection voltage generated by the second secondary winding m3 and the second rectifier circuit 3 in the power transformer 1 and the target voltage uniquely held by the control circuit 6. Be adjusted.

According to this embodiment, the control circuit 6 controls the feed voltage of the backup power based on the detection voltage input from the second rectifier circuit 3 and the target voltage held by the control circuit 6, so that the backup power is backed up. It is possible to provide a backup power supply control device A and a backup power supply device that can control the power supply voltage by themselves.

The present invention is not limited to the above embodiment, and for example, the following modifications can be considered.
(1) In the above embodiment, the backup power supply control device A and the backup power supply device mounted on the vehicle have been described, but the present invention is not limited thereto. The present invention is also applicable to applications other than vehicles.

(2) In the above embodiment, the second secondary winding m3 and the second rectifier circuit 3 are used to generate a detection voltage indicating the feed voltage of the backup power, but the present invention is not limited to this. For example, the second secondary winding m3 and the second rectifier circuit 3 may be omitted, and the output voltage of the first rectifier circuit 2, that is, the feed voltage of the backup power may be incorporated into the control circuit 6 as a detection voltage.

(3) In the above embodiment, a conversion circuit including a transformer 4 and an EN signal generation circuit 5 is adopted, but the present invention is not limited thereto.

A Backup power supply control device B Control device (power receiving side)
C Main battery D IGA switch E Battery ECU
1 Power transformer 2 1st rectifier circuit 3 2nd rectifier circuit 4 Transformer (conversion circuit)
5 EN signal generation circuit (conversion circuit)
6 Control circuit 7 Transistor (power switching element)

Claims (6)

A backup power supply control device that adjusts the voltage of battery power input from the outside and supplies the adjusted battery power to the power receiving side as backup power.
A power transformer in which the battery power is supplied to one end of the primary winding,
A rectifier circuit in which a pair of input ends are connected to both ends of the secondary winding of the power transformer to generate the backup power of a predetermined feed voltage.
A conversion circuit that generates a conversion permission signal by electrically isolating the permission signal input from the power receiving side, and
A power switching element whose output end is connected to the other end of the primary winding,
A backup power supply control device including a control circuit that generates a PWM signal for driving the power switching element by comparing the feed voltage with a predetermined target voltage based on the conversion permission signal. The permission signal is a pulse signal and
The backup power supply control device according to claim 1, wherein the conversion circuit includes an EN signal generation circuit that rectifies a signal obtained by isolating the pulse signal to generate the conversion permission signal. The backup power supply control device according to claim 2, wherein the conversion circuit includes a transformer that isolates the pulse signal. The power transformer comprises a second secondary winding.
The backup according to any one of claims 1 to 3, wherein the control circuit takes in a voltage obtained by rectifying the output of the second secondary winding by the second rectifier circuit as the feed voltage. Power control device. The backup power supply control device according to any one of claims 1 to 4, wherein the control circuit uses the battery power as a power source. With the battery
A backup power supply device comprising the backup power supply control device according to any one of claims 1 to 4, wherein the output of the battery is taken in as the battery power.

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